The maternal-effect mutation bicoid (bcd) is recessive. Inthe absence of the bicoid protein product, embryogenesis isnot completed. Consider a cross between a female heterozygousfor the bicoid mutation (bcd+/ bcd-) and a homozygousmale(bcd-/ bcd-). Predict the outcome (normal vs. failed embryogenesis) inthe F1 and F2 generations of the cross described.
Q: In Drosophila, the autosomal recessive brown eyecolor mutation displays interactions with both…
A: Since you have asked multiple questions, we will solve the first question for you. If you want any…
Q: Suppose that a female with the mutation (i.e., a heterozygous female) mates with a healthy male (the…
A: Alleles are the alternative forms of a gene that are located on the same locus of a homologous…
Q: cance of color blindness in humans is due to a recessive gene located on the X chromosome X linked).…
A: Mother × father XXc XcY Progeny - X Xc Xc XXc…
Q: A woman who sought genetic counseling is found to be heterozygousfor a chromosomal rearrangement…
A: The type of chromosomal abbretion in given figure is Translocation.
Q: I. Male Drosophila from a true-breeding wild-typestock were irradiated with X-rays and then mated…
A: J. Muller first showed in his experiment that exposure to certain dose of X-rays higher than the…
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: The objective of the Single Gene Inheritance project is to determine: Select one: Whether the…
A: Every trait is mainly governed by the gene which is the functional part of the DNA. Changes in genes…
Q: A Drosophila male is heterozygous for a reciprocaltranslocation between an autosome and the Y…
A: Chromosomal translocation is the abnormal condition of chromosomes with unusual rearrangement. It…
Q: A maternal effect gene in Drosophila, called torso, occurs as a functionalallele (torso+) and a…
A: Drosophila consist of acorn-head-thorax-abdomen-telson part.
Q: In maize trisomics, n + 1 pollen is not viable. If adominant allele at the B locus produces purple…
A: The trisomic condition is condition in which the normal diploid species has one additional…
Q: diploid individual with two identical alleles for a particular gene is said to be: a. homozygous…
A: An allele is a variant form of a gene. An organism that has two different alleles of the gene is…
Q: In marsupials like the opposum or kangaroo, X inactivation selectively inactivates the paternal X…
A: Since we only answer up to 3 sub-parts, we’ll answer the first three. Please resubmit the question…
Q: In 1995, doctors reported a Chinese family in whichretinitis pigmentosa (progressive degeneration of…
A: Since you have posted a question with multiple sub-parts, we are answering only first one for you.…
Q: In Neurospora, his2 mutants require the amino acidhistidine for growth, and lys4 mutants require…
A: Neurospora is a type of a fungus that has axon like striations on its spores. The spores of the…
Q: Drosophila females heterozygous for each of three recessive autosomal mutations with independent…
A: It is given that, drosophila females heterozygous have three phenotypic effects like thread…
Q: The mutant FMR-1 allele that causes fragile X syndrome is considered to be X-linked dominant…
A: Fragile X syndrome is a genetic disorder. It causes various developmental disorders that include…
Q: In Drosophila, an X-linked recessive mutation, scalloped (sd),causes irregular wing margins. Diagram…
A: Genetics is a study of genes, heredity, and genetic variation in an organism. Living organisms…
Q: In corn snakes, the wild-type color is brown. Oneautosomal recessive mutation causes the snake to…
A: In the given question the wild-type color is brown. One autosomal recessive mutation caused the…
Q: An attached-X female fly, XX ¬Y (see the “Insights and Solutions” box), expresses the recessive…
A: Inheritance or heredity is passing-on one trait from the parents to the progeny by either asexual or…
Q: A maternal effect gene in Drosophila, called torso, is found as afunctional allele (torso+) and a…
A: Maternal effect gene is an effector gene in which the phenotype of an offspring is determined by the…
Q: In Drosophila melanogaster, red eyes are dominant over white and the variation for this…
A: Genetics is a branch of the biology involved in the study of genes, genetic variation, and heredity…
Q: Assuming (i) that the two chromosomes in everyhomologous pair carry different alleles of somegenes,…
A: Homologous chromosomes are the ones that share some morphological features and have similar genetic…
Q: Female fruit flies homozygous for the X-linked white-eye alleleare crossed to males with red eyes.…
A: Drosophila melanogaster is a common fruit fly. It is most common subject used in majority of genetic…
Q: EXTRANUCLEAR INHERITANCE In drosophila, a recessive mutation (m-) of a maternal effect gene (MEG)…
A: Introduction Maternal effect genes are required in emvryo development in drosophila. Maternal…
Q: . A woman with Turner syndrome is found to be colorblind (an X-linked recessive phenotype). Both her…
A: Turner syndrome is a chromosomal disorder that impairs women's development. Half of the sex…
Q: In a vial of Drosophila, a research student noticedseveral female flies (but no male flies) with bag…
A: Fertilization is the process by which the male gamete, sperm, fertilize with the female gamete,…
Q: A Drosophila embryo dies during early embryogenesis due to arecessive maternal effect allele called…
A: The kind of inheritance in which, the characters do not separate according to the laws of Mendel is…
Q: During spermatogenesis, is there any difference in outcome between first- and second-division…
A: Spermatogenesis is the process of producing spermatozoa(haploid) from germ cells. In the…
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: 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: You have spent two decades studying a muscular dystrophy disorder. All previous pedigree data…
A: X linked disease is a type of sex linked disease in which the mutation is present in X chromosome.…
Q: In Drosophila, the vestigial wings recessive allele,vg, causes the wings to be very small. A…
A: Hello! Since you have asked multiple questions, we are answering only first question for you. If…
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: The maternal-effect mutation bicoid (bcd) is recessive. Inthe absence of the bicoid protein product,…
A: Introduction: Bicoid (Bcd) protein is a product of the bicoid gene having a maternal effect and is…
Q: Identify the type of chromosomal abnormality shown here: O inversion O deletion O insertion O…
A: Chromosomes are filamentous bodies present in the nucleus. They are self-replicating and play an…
Q: Consider two hypothetical recessive autosomal genesa and b, where a heterozygote is testcrossed to a…
A: Two hypothetical recessive autosomal genes a and b. a heterozygote is testcrossed to a double…
Q: The following list of four Drosophila mutations indicates the symbol for the mutation, the name of…
A: The dominant allele masks the expression of the recessive allele. So, the dominant allele is…
Q: Describe when X-chromosome inactivation occurs and how thisleads to phenotypic results at the…
A: Chromosomes are the carrier of genetic material deoxyribonucleic acid (DNA). They are coiled in…
Q: Using Drosophila notation: A.) Diagram the genotype of a female fly that is recessive for apterus…
A: Homozygous means both the alleles will be same and heterozygous means both the alleles will be…
Q: .Certain forms of human color blindness are inherited as X-linkedrecessive traits. Hemizygous males…
A: Color blindness is defined as the inability of the person to distinguish between colors, especially…
Q: In Drosophila, a cross (cross 1) was made between twomutant flies, one homozygous for the recessive…
A: Homozygous organisms are those that have two identical alleles. These can either be dominant or…
Q: Duchenne muscular dystrophy (DMD) is caused bya recessive mutant allele of an X-linked gene…
A: Duchenne muscular dystrophy (DMD) is a progressive form of muscular dystrophy that results in muscle…
Q: The XG locus on the human X chromosome has twoalleles, XG+ and XG. The XG+ allele causes the…
A: Genes that are closely placed in the chromosome, tend to get transferred together in the gametes,…
Q: Emery-Dreifuss muscular dystrophy is a condition that primarily aftects muscle and the cardiac…
A: Heterozygous When both type of alleles of a gene are found in an individual then it is said that…
Q: Morgan first suggested that theoriginal white-eyed male had two copies of the white-eye allele.…
A: Genetics is a study of genes, heredity, and genetic variation in an organism. Living organisms…
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: . 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: In Drosophila, the autosomal recessive dp allele ofthe dumpy gene produces short, curved wings,…
A: Since you have posted a question with multiple sub-parts, we are answering only first two for you.…
Q: In drosophila, a recessive mutation (m-) of a maternal effect gene results in an abnormal phenotype…
A:
The maternal-effect mutation bicoid (bcd) is recessive. In
the absence of the bicoid protein product, embryogenesis is
not completed. Consider a cross between a female heterozygous
for the bicoid mutation (bcd+/ bcd-) and a homozygous
male(bcd-/ bcd-).
Predict the outcome (normal vs. failed embryogenesis) in
the F1 and F2 generations of the cross described.
Trending now
This is a popular solution!
Step by step
Solved in 3 steps
- The maternal-effect mutation bicoid (bcd) is recessive. Inthe absence of the bicoid protein product, embryogenesis isnot completed. Consider a cross between a female heterozygousfor the bicoid mutation (bcd+/ bcd-) and a homozygousmale(bcd-/ bcd-). How is it possible for a male homozygous for the mutationto exist?In Drosophila, a cross (cross 1) was made between twomutant flies, one homozygous for the recessive mutationbent wing (b) and the other homozygous for the recessivemutation eyeless (e). The mutations e and b are alleles oftwo different genes that are known to be very closelylinked on the tiny autosomal chromosome 4. All the progeny had a wild-type phenotype. One of the female progeny was crossed with a male of genotype b e/b e ; we willcall this cross 2. Most of the progeny of cross 2 were of theexpected types, but there was also one rare female ofwild-type phenotype.a. Explain what the common progeny are expected tobe from cross 2.b. Could the rare wild-type female have arisen by (1)crossing over or (2) nondisjunction? Explain.Duchenne muscular dystrophy is a recessive disorder caused by a rare,loss-of-function allele that is located on the X chromosome in humans. Anunaffected woman (i.e., without disease symptoms) who is heterozygousfor the X-linked allele causing Duchenne muscular dystrophy has childrenwith a man with a functional (non-disease-causing) allele. What is theprobability that this couple will have an unaffected son?
- The recessive, X-linked z1mutation of the Drosophilagene zeste (z) can produce a yellow (zeste) eye coloronly in flies that have two or more copies of the wildtype white (w) gene. Using this property, tandem duplications of the w+ gene called w+Rwere identified.Males with the genotype y+ z1w+R spl+ / Y thus havezeste eyes. These males were crossed to females withthe genotype y z1 w+R spl / y+ z1 w+R spl+. (These fourgenes are closely linked on the X chromosome, in theorder given in the genotype, with the centromere tothe right of all these genes: y = yellow bodies; y+ =tan bodies; spl = split bristles; spl+ = normal bristles.) Out of 81,540 male progeny of these females,the following exceptions were found:Class A 2430 yellow bodies, zeste eyes, wild-type bristlesClass B 2394 tan bodies, zeste eyes, split bristlesClass C 23 yellow bodies, wild-type eyes, wild-type bristlesClass D 22 tan bodies, wild-type eyes, split bristlesa. What were the phenotypes of the remainder of the81,540 males…. In mice, the dominant allele Gs of the X-linked geneGreasy produces shiny fur, while the recessive wildtype Gs+ allele determines normal fur. The dominantallele Bhd of the X-linked Broadhead gene causesskeletal abnormalities including broad heads andsnouts, while the recessive wild-type Bhd+ alleleyields normal skeletons. Female mice heterozygousfor the two alleles of both genes were mated withwild-type males. Among 100 male progeny of thiscross, 49 had shiny fur, 48 had skeletal abnormalities,2 had shiny fur and skeletal abnormalities, and 1 waswild type.a. Diagram the cross described and calculate thedistance between the two genes.b. What would have been the results if you hadcounted 100 female progeny of the cross?Duchenne muscular dystrophy (DMD) is caused bya recessive mutant allele of an X-linked gene calleddystrophin. Rarely, females have disease symptomsas severe as those in males hemizygous for therecessive allele. These females are heterozygous forX-autosome reciprocal translocations where the Xchromosome breakage occurred in the middle of thedystrophin gene, breaking it into two pieces.a. If it is equally likely for X chromosome inactivation to spread from either of the X chromosomeinactivation centers (XICs; see Fig. 12.15) in thecells of this patient, what proportion of her cellswould you expect to have normal function of thedystrophin gene?
- .Certain forms of human color blindness are inherited as X-linkedrecessive traits. Hemizygous males are color-blind, but heterozygous females are not. However, heterozygous females sometimeshave partial color blindness.A. Discuss why heterozygous females may have partial color blindness.B. Doctors identified an unusual case in which a heterozygousfemale was color-blind in her right eye but had normal colorvision in her left eye. Explain how this might have occurred.The XG locus on the human X chromosome has twoalleles, XG+ and XG. The XG+ allele causes the presence of the Xg surface antigen on red blood cells,while the recessive XG allele does not allow antigento appear. The XG locus is 10 m.u. from the STSlocus. The STS+ allele produces normal activity ofthe enzyme steroid sulfatase, while the recessive STSallele results in the lack of steroid sulfatase activityand the disease ichthyosis (scaly skin). A man withichthyosis and no Xg antigen has a normal daughterwith Xg antigen. This daughter is expecting a child.a. If the child is a son, what is the probability he willlack Xg antigen and have ichthyosis?b. What is the probability that a son would have boththe antigen and ichthyosis?c. If the child is a son with ichthyosis, what is theprobability he will have Xg antigen?In drosophila, a recessive mutation (m-) of a maternal effect gene results in an abnormalphenotype wherein homozygous (m-m-) females produce eggs that cannot support embryonicdevelopment. Homozygous (m-m-) males, however, can still produce viable sperm. Using m+ todenote a normal gene, determine the genotypes and phenotypes of the F1s produce by a crossbetween a heterozygous female and a recessive male. From the offspring, backcross the recessivefemale with the paternal strain. What are the genotypes and phenotypes of the F2s?
- In humans, color vision depends on genes encodingthree pigments. The R (red pigment) and G (green pigment) genes are close together on the X chromosome,whereas the B (blue pigment) gene is autosomal. A recessive mutation in any one of these genes can cause colorblindness. Suppose that a color-blind man married awoman with normal color vision. The four sons from thismarriage were color-blind, and the five daughters werenormal. Specify the most likely genotypes of both parents and their children, explaining your reasoning. (Apedigree drawing will probably be helpful.) (Problem 50is by Rosemary Redfield.)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.Female fruit flies homozygous for the X-linked white-eye alleleare crossed to males with red eyes. On very rare occasions, an offspringof such a cross is a male with red eyes. Assuming these rareoffspring are not due to a new mutation in one of the mother’s Xchromosomes that converted the white-eye allele into a red-eyeallele, explain how a red-eyed male arises.