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Q1. Klinefelter syndrome (47, XXY) and Turner syndrome (45, X) are due to __________. A. improper...

Q1. Klinefelter syndrome (47, XXY) and Turner syndrome (45, X) are due to __________.

A. improper segregation of autosomes during mitosis

B. improper segregation of sex chromosomes during mitosis

C. improper segregation of autosomes during meiosis

D. improper segregation of sex chromosomes during meiosis

Q2. Sex determination and sexual differentiation is controlled by

A. the homogametic sex

B. sex chromosomes

C. homologous chromosomes

D. genetic information on autosomes

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Answer #1

1)option D is correct because The extra chromosome is retained because of a nondisjunction event during paternal meiosis I, maternal meiosis I, or maternal meiosis II(gametogenesis).

2)option B is correct because (1) Sex chromosome genes are the primary factors causing sexual differentiation. In species with heteromorphic sex chromosomes(mammals, birds, etc.), all sexdifferences arise from the genetic inequality found in the sex chromosomes of male and female zygotes.

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