3. A eukaryotic diploid cell from an organism with the XX-XO sex determination s

Question

3. A eukaryotic diploid cell from an organism with the XX-XO sex determination system has two pairs of autosomes and one X chromosome, shown below. (2 pts each part)

3a. From what type of individual is this cell?

a. male

   b. female

c. hermaphrodite

d. monoecious

3b. Imagine that this cell is in gamete-producing tissue. The cell begins to go through meiosis. When the cell reaches meiosis II, it has become two cells. Which of the following is a possible combination of chromosomes in one of the two cells when it goes through metaphase of meiosis II?

a. one chromosome with A allele, one with B allele, and two X chromosomes

b. one chromosome with A allele, one with a allele, one with B allele, one with b allele, and two X chromosomes

c. a pair of sister chromatids with A allele, a pair of sister chromatids with B allele

d. a pair of sister chromatids with a allele, a pair of sister chromatids with B allele, a pair of sister chromatids X

e. C and D are both possible.

3c. What is the probability of a gamete from this individual having the following genotype: alleles A and b, chromosome X?

a. 1/2

b. 1/4

c. 1/6

d. 1/8

Explanation / Answer

3a.

a. 4 + X

b. 4 + XX

c. 4 + XX

d. 4 + X

3b. e

3c. d

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