Question

During gamete formation in a horse, how many chromosome pairs of a cell duplicate?

a) 32
b) 46
c) 64
d) 128

Answer 1

During gamete formation in a horse, the chromosome pairs of a cell duplicate through a process called meiosis. In meiosis, the number of chromosome pairs is halved. Since horses typically have 64 chromosomes, the correct answer is 64. Therefore, the correct answer is c) 64.

Step-by-step explanation:

In meiosis, a diploid cell undergoes two rounds of division, resulting in the formation of four haploid cells, or gametes. Horses are diploid organisms with a total chromosome count of 64. During the first division (meiosis I), homologous chromosome pairs separate, reducing the chromosome number by half. Therefore, each resulting cell has 32 chromosomes.

The second division (meiosis II) is similar to mitosis but involves the separation of chromatids rather than chromosomes. This division further divides the cells produced in meiosis I. As a result, each of the four final gametes ends up with 16 chromosomes. However, since chromosomes are counted in pairs, the total number of chromosome pairs remains 32.

To get the total number of chromosomes, we count both homologous chromosomes and express the answer in pairs. Therefore, in a horse, which starts with 32 chromosome pairs, during gamete formation, the chromosome pairs duplicate, resulting in a total of 64 chromosomes in each gamete. This process ensures genetic diversity in the offspring by mixing and matching genetic material from both parents during fertilization.

Therefore, the correct answer is c) 64.

Answer 2

During gamete formation in a horse, how many chromosome pairs of a cell duplicate is c) 64.

Step-by-step explanation:

During gamete formation in a horse, cells undergo a process called meiosis. In this process, chromosome pairs are halved, resulting in the formation of gametes with half the chromosome number of the parent cells. Horses, like most mammals, have a diploid chromosome number of 64. Therefore, during gamete formation, each cell duplicates its chromosome pairs, and the resulting gametes carry 32 chromosomes.

Meiosis involves two divisions, reducing the chromosome number from diploid to haploid. In the first division, homologous chromosome pairs are separated, and in the second division, sister chromatids are separated. This ensures genetic diversity in offspring and maintains the correct chromosome number across generations.

Option C is correct.