Item 6 Consider the following diploid cell, in which 2n = 8. The blue chromosome

Question

Item 6

Consider the following diploid cell, in which 2n = 8. The blue chromosomes carrying genes A, B, C, and D are maternal in origin, whereas the red chromosomes carrying genes a, b, c and d are paternally derived.

Note: In spite of suspect discrepancies in the drawing, this cell contains only acrocentric and metacentric chromosomes.

Part D

Given a population of cells like this one that undergo meiosis, what fraction of the gametes produced will have the genotype ABCD?

Enter your answer as a fraction.

Part E

Given a population of cells like this one that undergo meiosis, what fraction of the gametes produced will have two maternal chromosomes and two paternal chromosomes?

Enter your answer as a fraction.

Part F

Given a population of cells like this one that undergo meiosis, what fraction of the gametes produced will have some chromosomes of both maternal and paternal origin?

Enter your answer as a fraction.

Explanation / Answer

ABCD x abcd

D) Fraction of the gametes produced will have the genotype ABCD = 1/ 16 = 0.0625

E)Fraction of the gametes produced will have two maternal chromosomes and two paternal chromosomes = 1/4 = 0.25

F)Fraction of the gametes produced will have some chromosomes of both maternal and paternal origin = 1/2 = 0.5

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