Question

deana is studying the karyotype of an unknown human donor. she observes that in each of the chromosome pairs, the two chromosomes have the same size and shape. what can deana conclude from these observations? a. the donor is female. b. the donor is male. c. the donor will express only the dominant forms of traits. d. the donor will express only the recessive forms of traits.

Explanation:

In human karyotypes, female sex chromosomes are two X chromosomes (same size/shape), while males have X and Y (different). The observation of same - sized/ - shaped chromosome pairs in each pair (including sex chromosomes, implied here) indicates the donor has two X chromosomes, so the donor is female. Options C and D are about trait expression, which isn't related to karyotype chromosome - size/shape observation. Option B would involve different - sized sex chromosomes (X and Y), which doesn't match the observation.

Answer:

A. The donor is female.