6. The incidence of Down syndrome will be very high(somewhat less than 50%) among the offspring of aparent with Down syndrome. Diagram meiosis in theDown syndrome parent to explain why progeny havesuch a high risk for chromosome 21 aneuploidy.Explain in addition why the incidence of Down syndrome among these children might be less than 50%.

Q: 5. This is a pair of homologous chromosomes. The individual is homozygous for gene A and…

A: This is a question about meiosis.

Q: Down Syndrome (trisomy 21) is caused by an error in meiosis which results in the presence of three…

A: Meiosis and mitosis Meiosis is the reductional division in which the parental cells divide to form a…

Q: 2. In the cells below, draw the two possible arrangements of Abdul's sex chromosomes and the…

A: The meiosis is the cell division process by which a diploid (2n) cell divides it's nucleus twice and…

Q: 6. If two genes are independently assorted during meiosis, which assumption is most likely true?…

A: Mendel's law of independent assortment states that two alleles or genes will be sorted independently…

Q: 6. Why is it necessary for the DNA to replicate prior to cell division? A. so that each daughter…

A: 6. B. so that each daughter cell will have a complete copy of genetic material.  7.  Purple = PP,…

Q: What are the four types of changes in chromosomal structure?

A: Chromosomes are filamentous bodies present in the nucleus. They are composed of DNA(…

Q: 4. Assume no crossing over between homologous chromosomes, what is the probability that two randomly…

A: Humans have 23 pair of chromosome. Out of which 22 are autosomes while 23rd pair is allosome (sex…

Q: 4. a. Give at least three examples of types of mutationsthat would disrupt the process of mitotic…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: 4. Characterize the following human chromosomes as to size and as to position of its centromere.…

A: human chromosome consist of 22 autosomes and 1 sex chromosome.

Q: How do the stages of mitosis and meiosis occur in a specific order and never alternate?

A: The process that occurs in a cell incorporating division of the genome, cytoplasmic and other…

Q: 3. RR and Rr carrots are orange, and rr carrots are white. But in an Rr carrot, a rare mitotic…

A: rr is the gene responsible for the white phenotype. first, the cells go in the g0 phase after that…

Q: 4. Suppose that a parent Drosophila is e ca* e ca The gamete frequency is as follows: e'ca e'ca e ca…

A: The gamete which contains a new combination of alleles as compared to its parent is known as a…

Q: 2. Using the same set of chromosomes (& the same color), illustrate meiosis. Allow crossing over to…

A: Mitosis is cell duplication

Q: Draw the chromosomes of a cell with genotype AaBBCc in prophase I of meiosis before synapsis and…

A: Prophase 1 of meiosis 1 is the first stage of meiosis 1 characterized by the disintegration of…

Q: 2. Compare any differences in the appearance of genes on chromosomes in gamete cells when crossing…

A: Crossing over : It is essential for the segregation of chromosomes during meiosis . It also accounts…

Q: 2. In the human life cycle, meiosis occurs during the production of 3. In the plant life cycle, the…

A: A diploid organism is an organism that consists of two complete sets of chromosomes (2n) in the…

Q: 3. With modern molecular methods it is now possibleto examine variants in DNA sequence from a…

A: Given genotype, John’s father = B1 B2 and D1D 4 Mother = B3B3 and D 2D 3

Q: 2. List 3 important events that occur during meiosis and provide a justification why each should…

A: The indirect process of cell division in which the chromosome of parent cells divide once, but…

Q: 7. How is 2n = 6 associated with meiosis? 8. What is the purpose of the process of mitosis? 9. What…

A: # Here I am giving answer of question 7,8 and 9 . Please send questions one by one in the portal.…

Q: 2. Compare an autohexaploid and an allohexaploid to each other with respect to the characteristics…

A: Autopolyploids  A individual that contains more than two whole copy of its own genome.

Q: 2.) In fruit flies, L = long wings and 1 = short wings. When a long-winged fly is crossed with a…

A: In the given question, The dominant trait is Long wings which can be denoted by L. The recessive…

Q: 1. How many different chromosomal combinations (genetic variation via independent assortment) can…

A: Introduction :- Meiosis is a process in which the number of chromosomes in a cell is reduced before…

Q: Explain how polyribosomes form. B. Why might you expect the insertion of 3 DNA base pairs to be less…

A: A. Polysomes are framed during the prolongation stage when ribosomes and lengthening factors combine…

Q: 2. Identify the kind of chromosome error in each diagram. Chromosomal Error X X Y TIID ×

A: Chromosomal errors result in various kinds of diseases which are incurable and decrease the life…

Q: 4. Consider two recessive sex-linked traits in Drosophila melanogaster, white eyes and yellow…

A: The X linked genes are found on the X chromosome. The linkage is the tendency of two genes pass…

Q: 3. There are 40 chromosomes in somatic cells of the house mouse. (a) How many chromosomes does a…

A: As Per Bartleby Guidelines, only first 3 parts of a question are answered. For further answers…

Q: division? A. process results in variation of organisms   B. daughter cells has the same gamete…

A: Meiosis is a process in which a single cell divides twice to produce four cells with half the amount…

Q: Explain how nondisjunction in meiosis is responsible for chromosome abnormalities such as Down…

A: Meiosis is the phenomeon that is well known term and usually discreibe in which diploid cells divide…

Q: 3. What are other types of chromosomal aberrations? List examples for each type.

A: Chromosome is a compact structure of a DNA molecule wrapped around some proteins. It is generally…

Q: what is The random distribution of alleles of unlinked genes into gametes?

A: In genetics, Mendel introduces two laws that describe how the alleles are distributed on progeny.…

Q: 8 Why X-chromosome aneuploidy can  cause sterility

A: Chromosomes are long thread-like structures that carry coded genetic information in the form of DNA.…

Q: 9. In corn, the diploid chromosome number is 20. How many chromosomes would you find in the a.…

A: Megasporogensis is the process of formation of megaspore mother cell which is diploid (2n)  cell and…

Q: 5. By conducting testcrosses, researchers have determined that corn has ten linkage groups. How many…

A: To determine the genotype, the experiments are done in which organism of dominant phenotype is…

Q: 1.  Why is the incidence of trisomy of larger chromosomes rarer than the incidence of trisomy of…

A: A trisomy is an abnormal number of chromosome conditions in which instead of two there are three…

Q: 2 In mammals, males have two different sex chromosomes (X and Y) and females have two similar sex…

A: Sex of an individual human or birds is determined by the presence of specific chromosomes. Usually…

Q: The condition of a zygote with three copies of a chromosome is known as ________.

A: According to guidelines we have to answer the first question only. so please kindly post the…

Q: 1. How will the offspring be affected if one of the gametes or one of the parent carry an impaired…

A: As per the company's guidelines we are supposed to answer a single question at a time only. Please…

Q: 4) An organism has a diploid number of 16 in a primary oocyte. (a) How many tetrads are present in…

A: An oocyte is produced in the ovary during the process of gametogenesis in female which initiates…

Q: 9. Neither Mendelian genetics nor genetic linkage can accurately explain all forms f chromosome…

A:

Q: 1. Compare the number of chromosomes in the Down syndrome with the nor- mal karyotypes explain the…

A: Chromosomes are filamentous bodies present in the nucleus. They are composed of DNA(…

Q: 3. Consider the chromosome pattern AAAXXY in Lychnis. What sex is this? a. Male b. Male with…

A: Chromosomes are thread-like structures found within the nucleus of both animal and plant cells.…

Q: 7. Domestic house cats have a diploid chromosome number of 38. How many chromosomes would you expect…

A: Domestic cats have 38 chromosomes. The chromosome number generally refers to the number of…

Q: 8. Down Syndrome most commonly results from having three copies (trisomy) of chromosome 21 instead…

A: Meiosis is responsible for producing the four haploid gametes from the parent cell.

Q: 1. A nondisjunction is a rare event during meiotic division wherein the homologous chromosomes fail…

A: The "cell cycle", also known as "cell division", is a set of processes that occur in a cell leading…

Q: 2. Compare an autohexaploid and an allohexaploid to each other with respect to the characteristics…

A: The number of chromosomes in a cell's nucleus is referred to as ploidy. Polyploid organisms contain…

Q: 3. If a gamete of a FISH-X has 32 chromosomes, how many of each of the following structures will be…

A: “Since you have posted a question with multiple sub-parts, we will solve the first three sub-parts…

Q: 5. Assume that D, E, F, G, H, and I are autosomal genes on different chromosomes. From the mating…

A: A trait is a characteristic features that is unique to particular individual . Each trait is…

Q: 4. Down syndrome, a nondisjunction disorder associated with mental disability, occurs when a person…

A: Down syndrome, also called trisomy 21 is a genetic disorder caused by the presence of all or part of…

Mitochondrial Mutations

A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.