Q: In guinea pigs, the allele for black fur (B) is dominant over the allele for brown (b) fur. A black…
A: All the living cells go through a series of stages known as the cell cycle. Every cell has…
Q: In humans, as well as in many other animals and some plants, the sex of the individual is determined…
A: Haemophilia is an inherited bleeding disorder where blood doesn't clot properly. It is caused when…
Q: Provide four sources of error that can cause mistakes during meiosis
A: Meiosis : It's the reductional division in which a diploid cell divides to form four haploid…
Q: What is chromosomal theory of inheritance? List the ways in which genes and chromosomes behave…
A: "Since you have asked multiple questions, we will solve the first question for you. If you want any…
Q: In humans, as well as with many other animals, sex is determined by special sex chromosomes. An…
A: Sex linked traits are the traits that are present in the Sex Chromosome that is X and Y . These…
Q: In a rare event, the human ovaries may release two ovum during ovulation and each ovum may…
A: Introduction Usually there is only one embryo develops at a time in a single pregnancy but in some…
Q: The following X-linked recessive traits are found in fruit flies:vermilion eyes are recessive to red…
A: DNA is the genetic material in most living organisms. It is the information hub of the cell that…
Q: On average, what proportion of the genome in the following pairs of humans would be exactly the same…
A: Meiosis is a cell division through which gametes are produced. One diploid eukaryotic cell divides…
Q: On average, what proportion of the genome in the following pairs of humans would be exactly the same…
A: Chromosomes are carrier of deoxyribonucleic acid (DNA). DNA is the genetic material. Each cell has…
Q: A woman with an abnormally long chromosome 13 (and a normalhomolog of chromosome 13) has children…
A: Since this is a disclaimer part with multiple questions, we will answer the first question alone…
Q: Genes that cause Prader-Willi syndrome and Angelman syndromeare closely linked along chromosome 15.…
A: Chromosome 15 contains closely linked genes which are paternally or maternally imprinted. Its…
Q: Drosophila may be monosomic for chromosome 4, yet remain fertile.Contrast the F1 and F2 results of…
A: Chromosomes are thread-like structures found in the nucleus of plant and animals. DNA is packed into…
Q: what is the probability that he might be a carrier of the recessive gene?
A: Cystic fibrosis is associated with the CFTR gene that encodes a protein that helps thin the mucous…
Q: A DNA variant has been found linked to a rare autosomal dominant disease in humans and can thus…
A: A variant of DNA (deoxyribose nucleic acid) is linked to a rare type of dominant, autosomal disease…
Q: Crossing over, or recombination, is thought to be evolutionarily advantageous because it continually…
A: Male individuals contain a single Y chromosome. It contains important genes that determine the sex…
Q: A couple planning their family are aware that through the pastthree generations on the husband’s…
A: All the 46 chromosomes carry important information for the growth and development of the embryo. If…
Q: Explain how an individual can have Down's Syndrome, and a karyotype that reveals 46 chromosomes.…
A: A genetic disorder is a condition that is caused in whole or in part by a deviation from the…
Q: On rare occasions, an organism may have three copies of achromosome and therefore has three copies…
A: Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate properly…
Q: On rare occasions, people are born with a condition known as uniparental disomy. It happens when an…
A: Human contains two number of chromosomes 15, one inherited from mother (maternal) and one from…
Q: Duchenne muscular dystrophy is sex linked and usuallyaffects only males. Victims of the disease…
A: Duchenne muscular dystrophy is an X-linked recessive disorder. Males have an XY chromosomal pattern,…
Q: theory of inheritance states that genes are on chromosomes. Therefore, any chromosomal abnormality…
A: Chromosomes- these are the structure that is present in the nucleus of cell. In simple words you…
Q: . An allotetraploid species has a genome composed oftwo ancestral genomes, A and B, each of which…
A: An allotetraploid is a condition in which a hybrid contains chromosomes 4 times that of a haploid…
Q: On average, what proportion of the genome in the following pairs ofhumans would be exactly the same…
A: Genome is a complete set of genes in organism needed for its normal body functioning. For example:…
Q: Which of the following events or processes can result in Patau syndrome, Turner Syndrome, or…
A: The gene is the basic unit of heredity. Most of the organisms have Deoxyribonucleic acid (DNA) as…
Q: A woman who sought genetic counseling is found to be heterozygousfor a chromosomal rearrangement…
A: Chromosome distortions remember changes for chromosome number (gains and losses) and changes in…
Q: Genes that influence a given characteristic and arealigned with one another on a chromosome pair…
A: The branch of biology which deals with genes and their heredity and the genetic variation is called…
Q: Familial Down syndrome is similar to primary Down syndrome in that it is caused by trisomy 21.…
A: thank you please give a like if there is any Non-loaded images in answer section, it will be…
Q: In some genetically engineered corn plants, a Bt gene was inserted into a chromosome. The Bt gene…
A: INTRODUCTION The genetically modified organisms in Bt corn are mainly called GMOs. In…
Q: A couple planning their family are aware that through the pastthree generations on the husband’s…
A: The karyotype banding analysis is the test that is done in a person's DNA for finding the normal and…
Q: Which of the following describes the difference between genetic maternal effect and cytoplasmic…
A: Maternal is a term related to the mother.
Q: Achondroplasia is a dominant trait that causes a characteristicform of dwarfism. In a survey of…
A: Introduction: The genetic macromolecule referred to as DNA is highly stable with regards to its base…
Q: The recessive, X-linked z1mutation of the Drosophilagene zeste (z) can produce a yellow (zeste) eye…
A: Gene is the specific sequence of nucleotide in deoxyribonucleic acid (DNA) or ribonucleic acid (RNA)…
Q: An individual comes into your genetics clinic to be tested for any anomalies. When looking at their…
A: Given: An individual come to your genetics clinic to be tested for any anomalies.When looking at…
Q: Recessive maternal effect genes are identified in flies (for example)when a phenotypically normal…
A: Drosophila is usually used for genetic studies in the laboratory. The phenotype of the offspring can…
Q: In humans, color vision depends on genes encodingthree pigments. The R (red pigment) and G (green…
A: Genetics is a part of science that deals with the investigation of genes, genetic variation, and…
Q: Duchenne muscular dystrophy is a recessive disorder caused by a rare,loss-of-function allele that is…
A: Duchenne muscular dystrophy (DMD) is a quickly progressive type of muscular dystrophy that happens…
Q: In 1965 a faulty study was performed, which suggested that the XYY karyotype was associated with…
A: XYY karyotype - Males with XYY syndrome have 47 chromosomes because of the extra Y chromosome. This…
Q: Genetic recombination or "crossing over" and random assortment are two ways in which genetic…
A: Introduction : Cell division is the means of reproduction in which all cells need to copy their…
Q: The following X-linked recessive traits are found in fruit flies:vermilion eyes are recessive to red…
A: The initial step is to decide the request for the three genes.This should be possible by assessing…
Q: hich of the following is least likely to produce genetic variation in the offspring of an…
A: Answer: GENETIC VARIATION : It is the variety or changes in the genetic makeup of an individual from…
Q: In mice, dwarfism is caused by an X-linked recessive allele, and pink coat is caused by an autosomal…
A: According to the given question, In mice, dwarfism is caused by an X-linked recessive allele, and…
Q: The following X-linked recessive traits are found in fruit flies:vermilion eyes are recessive to red…
A: Inheritance or heredity is passing-on one trait from the parents to the progeny by either asexual or…
Q: A tomato geneticist attempts to assign five recessivemutations to specific chromosomes by using…
A: SECONDARY trisomics, or persons who have one isochromosome in addition to their regular somatic…
Q: Men have XY (or YX) chromosomes and women have XX chromosomes. X-linked recessive genetic…
A: The trait is X linked recessive in nature. The X chromosome encodes normal phenotype. It is…
Q: When does the erasure and reestablishment phase of genomicimprinting occur? Explain why it is…
A: Genomic imprinting is a type of epigenetics, where an alteration in gene or chromosome changes the…
Q: . In mice, the dominant allele Gs of the X-linked geneGreasy produces shiny fur, while the recessive…
A: In mice, the dominant allele Gs of the X-linked gene Greasy gives shiny fur. The recessive wild-type…
Q: A man with a pointed nose and a woman with a round nose have a daughter with a round nose. This…
A: Given Round nose - X linked trait Round nose - dominant Pointed nose - recessive Father -…
Q: In diploid yeast strains, sporulation and subsequent meiosis can produce haploid ascospores, which…
A: Ascospores are the spores formed in the members of the phylum Ascomycota. This is the defining…
Q: Which of the following is not a common explanation for a dominantdisorder?a. Haploinsufficiencyb. A…
A: Dominant disorders are the genetic disorders that are caused due to the inheritance of the dominant…
Q: On average, what proportion of the genome in the following pairs of humans would be exactly the same…
A: Crossing over takes place when the chromosomal homologs swap information during the metaphase of…
Mutations in DNA that result in altered proteins can cause
hereditary diseases. Pedigree studies and genetic testing may
clarify the risk of disease. At the chromosome level, nondisjunction
during meiosis can result in gametes with too few or too many
chromosomes, most of which produce inviable offspring.
Imprinting refers to inactivation of alleles depending on which
parent the alleles come from; offspring in whom imprinting occurs
appear haploid for the affected gene even though they are diploid.
During spermatogenesis, is there any difference in outcome between first- and second-division nondisjunction?
Trending now
This is a popular solution!
Step by step
Solved in 5 steps with 4 images
- The gene for the production of eye colour in this species of fruit fly can be expressed aseither normal red-eyes or as brown-eyes. The allele for the normal red eyes is dominant tothat of brown, and is transmitted in normal Mendelian fashion.A gene involved with body colour in this species of fruit fly is located on the non-homologousportion of the X chromosome, and has two alleles, grey and yellow, where the grey allele isdominant to yellow.The two genes are NOT linked.a) Produce a key to clearly show the nature of the alleles associated with the eye colour inthis species of Drosophila, and in each case justify your choice of letters and / or style ofpresentation to best depict the genetics involved.In individuals affected by cystic fibrosis, salt crystals may appear afterperspiration dries up. In addition, the disease causes respiratory disorderswhich can be both debilitating and lethal. It occurs in individuals homozygousfor recessive gene. If 2 normal parents had a daughter with the symptoms ofthis disease, and a normal son, what is the probability that he might be acarrier of the recessive gene?Express answer in fraction form.When does the erasure and reestablishment phase of genomicimprinting occur? Explain why it is necessary to erase an imprintand then reestablish it in order to always maintain imprinting fromthe same sex of parent.
- On average, what proportion of the genome in the following pairs ofhumans would be exactly the same if no crossing over took place? (Forthe purposes of this question only, we will ignore the special case of theX and Y sex chromosomes and assume that all genes are located onnonsex chromosomes.)a. Father and childb. Mother and childc. Two full siblings (offspring that have the same two biological parents)d. Half siblings (offspring that have only one biological parent incommon)e. Uncle and niecef. Grandparent and grandchildMen have XY (or YX) chromosomes and women have XX chromosomes. X-linked recessive genetic diseases (such as juvenile retinoschisis) occur when there is a defective X chromosome that occurs without a paired X chromosome that is not defective. Represent a defective X chromosome with lowercase x, so a child with the xY or Yx pair of chromosomes will have the disease and a child with XX or XY or YX or xX or Xx will not have the disease. Each parent contributes one of the chromosomes to the child. Complete parts a through d below. a. If a father has the defective x chromosome and the mother has good XX chromosomes, what is the probability that a son will inherit the disease? nothing (Type an integer or a decimal. Do not round.) b. If a father has the defective x chromosome and the mother has good XX chromosomes, what is the probability that a daughter will inherit the disease? nothing (Type an integer or a decimal. Do not round.) c. If a mother has one defective x…Table shows that Turner syndrome occurs when an individualinherits one X chromosome but lacks a second sex chromosome.Can Turner syndrome be due to nondisjunction duringoogenesis, spermatogenesis, or both? If a phenotypically normalcouple has a color-blind child (due to a recessive X-linkedallele) with Turner syndrome, did nondisjunction occur duringoogenesis or spermatogenesis in this child’s parents? Explainyour answer.
- A sex-influenced trait in humans affects the length of the index finger. A short allele is dominant in males and recessive in females.Heterozygous males have an index finger that is significantly shorterthan the ring finger. The gene affecting index finger length is locatedon an autosome. A woman with short index fingers has childrenwith a man who has normal index fingers. They produce five children in the following order: female, male, male, female, male. Theoldest female offspring has one daughter with a man who has normal fingers. The youngest male among the five children has childrenwith a woman with short index fingers; they have two sons. Drawthe pedigree for this family. Indicate the phenotypes of every individual (filled symbols for individuals with short index fingers andopen symbols for individuals with normal index fingers)In Neurospora, his2 mutants require the amino acidhistidine for growth, and lys4 mutants require theamino acid lysine. The two genes are on the samearm of the same chromosome, in the ordercentromere - his2 - lys4.A his2 mutant is mated with a lys4 mutant. Draw all ofthe possible ordered asci that could result from meioses in which the following events occurred, accountingfor the nutritional requirements for each ascospore.Ascospores without any copy of a chromosome willabort and die, turning white in the process.a. A single crossover between the centromere and his2b. A single crossover between his2 and lys4c. Nondisjunction during the first meiotic divisiond. Nondisjunction during the second meiotic divisione. A single crossover between the centromere andhis2, followed by nondisjunction during the firstmeiotic divisionf. A single crossover between his2 and lys4,followed by nondisjunction during the firstmeiotic divisionOn rare occasions, an organism may have three copies of achromosome and therefore has three copies of the genes on thatchromosome (instead of the usual number of two copies). Forsuch a rare organism, the alleles for each gene usually segregateso that a gamete will contain one or two copies of the gene. Let’ssuppose that a rare pea plant has three copies of the chromosomethat carries the height gene. Its genotype is TTt. The plant is alsoheterozygous for the seed color gene, Yy, which is found on adifferent chromosome. With regard to both genes, how manytypes of gametes can this plant make, and in what proportions?(Assume that it is equally likely that a gamete will contain oneor two copies of the height gene.)
- A gene that controls the ability to see red and green is located on the X chromosome but not on the Y chromosome. There is a recessive nonfunctional allele for this gene that can cause red-green color blindness if the person possessing it does not also have the dominant normal gene. Consider the case of a carrier mother who is heterozygous for the red-green vision gene and a father who has normal vision. Use XB = normal vision, Xb = color-blind vision. What is the chance the parents would have a color-blind boy? A color-blind girl? What about a girl or boy with normal vision? Redo the Punnett square for a carrier mother (XBXb) and a color-blind father (XbY). Do the chances of having color-blind children change? How?. An allotetraploid species has a genome composed oftwo ancestral genomes, A and B, each of which havea basic chromosome number (x) of seven. In thisspecies, the two copies of each chromosome of eachancestral genome pair only with each other duringmeiosis. Resistance to a pathogen that attacks the foliage of the plant is controlled by a dominant allele atthe F locus. The recessive alleles Faand Fbconfersensitivity to the pathogen, but the dominant resistancealleles present in the two genomes have slightly different effects. Plants with at least one FAallele areresistant to races 1 and 2 of the pathogen regardlessof the genotype in the B genome, and plants with atleast one FBallele are resistant to races 1 and 3 of thepathogen regardless of the genotype in the A genome.What proportion of the self-progeny of an FA Fa FB Fbplant will be resistant to all three races of the pathogen?A woman who sought genetic counseling is found to be heterozygousfor a chromosomal rearrangement between the second andthird chromosomes. Her chromosomes, compared to those in anormal karyotype, are diagrammed on the next page:(a) This woman is phenotypically normal. Does thissurprise you? Why or why not? Under what circumstancesmight you expect a phenotypic effect of such arearrangement?
