The hedgehog is a diploid animal with n = 44. How many chromatids are there in a
ID: 84950 • Letter: T
Question
The hedgehog is a diploid animal with n = 44. How many chromatids are there in a hedgehog gamete after meiosis is complete? Select one: a. 44 b. 88 c. 352 d. 22 e. 176 The HBB gene, which encodes the beta subunit of hemoglobin, and the ATM gene, which encodes an enzyme that repairs breaks in DNA, are both on human chromosome 11. If you had children, what event in meiosis makes it possible for your child to inherit your father's HBB gene and your mother's ATM gene? Select one: a. Non disjunction b. mutation c. independent assortment d. crossing over e. cytokinesisExplanation / Answer
(1) According to the question, hedgehog is a diploid animal with n = 44.
n = 44 indicates its haploid number.
Hence, diploid number of chromosomes would be 2n = 88.
During meiosis, the number of chromosomes in the parent cell is reduced by half and four gamete cells are produced. The gametes thus produced will have half the number of chromosomes of parent cells. In meiosis, the cell containing diploid number of chromosomes (2n) is converted into four cells, each having haploid number of chromosomes (n).
Therefore in this case,
2n = 88 diploid number,
After gamete formation, this number is reduced to half, that is n = 88/2 = 44 haploid number.
There will be 44 chromatids in hedgehogs after meiosis is complete.
Thus, option a is the answer.
(2) The process of crossing over makes it possible for genes to be passed on from grandparents to grandchildren. It is the exchange of genetic material between two chromosomes that results in recombinant chromosomes during meiosis. The process of crossing over takes place during Prophase 1.
When crossing over takes place, the genes from each of the grand parents are exchanged and the resulting parental chromosome may have both the HBB and ATM gene. This recombinant chromosome containing both the genes in the parent are then passed on to the subsequent generation. Thus, the genes from grandparents are inherited by the grandchildren in this way.
Therefore, the answer is option d, crossing over.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.