Consider the following diploid cell, in which 2n = 8. The blue chromosomes carry

Question

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 A

Which gene(s) is/are found on the p arm of an acrocentric chromosome?

Part B

Which gene(s) is/are found on a metacentric chromosome?

Part C

If this cell undergoes meiosis, how many tetrads will form during prophase I?

Enter your answer as a number.

Explanation / Answer

p is the short arm of the chromosome, and q is the long arm.

A and C genes carrying chromosomes are acrocentric (having one long and one short arm) while B and D genes carrying chromosomes are metacentric (having two equal arms).

Part A:- C gene is found on p arm of acrocentric chromosome.

Part B:- B and D genes

Part C:- 4 tetrads will be formed.

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