AP BIOLOGY

HEREDITY

MUTATIONS

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Domestic cats have 38 chromosomes in their skin cells. How many chromosomes are in the gamete of a domestic cat?

A	76
B	38
C	19
D	9

Explanation:

Detailed explanation-1: -2n=38. So n=19. Therefore, 19 chromosomes are inherited from each parent. Gametes (haploid) have 19 chromosomes.

Detailed explanation-2: -Domestic cats have 38 chromosomes, including 18 autosomal pairs and the sex chromosomes, X and Y.

Detailed explanation-3: -Answer and Explanation: The chromosome number during mitosis always remains the same. If the cat cell had 38 chromosomes, the resulting daughter cells will also have 38 chromosomes.

Detailed explanation-4: -The term haploid can also refer to the number of chromosomes in egg or sperm cells, which are also called gametes. In humans, gametes are haploid cells that contain 23 chromosomes, each of which a one of a chromosome pair that exists in diplod cells.

Detailed explanation-5: -Because the number of chromosomes does not change in this division since 2N= 38, however, sex cells will always have a haploid number of chromosomes. Thus, the sperm will have 19 chromosomes because it will get reduced to haploid at the end of meiosis I.

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