Sex Determination 1.) Which of the following would be the result of nondisjuncti

Question

Sex Determination

1.) Which of the following would be the result of nondisjunction of the sex chromosomes?

a. Turner syndrome

b. Edward syndrome

c. Patau syndrome

2.) A eukaryotic diploid cell from an organism with the ZZ-ZW sex determination system has two pairs of autosomes and a pair of sex chromosomes (Z and W). The individual from which this cell came is:

a. female.

b. hermaphrodite.

c. monoecious.

A eukaryotic diploid cell from an organism with the ZZ-ZW sex determination system has two pairs of autosomes and a pair of sex chromosomes (Z and W). What is the probability of a gamete from this individual that has the following genotype: alleles A; b and chromosome Z?

a. 1/2

b. 1/4

c. 1/8

Explanation / Answer

Answer:

1. (a) Turner's syndrome (XO)

Turner's syndrome occurs due to a non disjunction of X chromosomes.

2. (a) Female

In some birds, butterflies, moths, and other organisms, the female is the heterogametic sex. These females are designated ZW, while the males are ZZ.

3. (c) 1/8

The probability of a gamete from this individual that has the following genotype: alleles A; b and chromosome Z is 1/8.

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