AP BIOLOGY

CELL DIVISION

MEIOSIS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A meerkat has 36 total chromosomes in each body cell. After meerkat cells undergo the process of meiosis, each gamete will have
A
16 chromosomes
B
18 chromosomes
C
36 chromosomes
D
72 chromosomes
Explanation: 

Detailed explanation-1: -Meiosis results in reduction of chromosome number to one half in the normal diploid cell. Thus, if a cell has 36 chromosome before meiosis. After meiosis the four daughter cells produced will be having 18 chromosomes each.

Detailed explanation-2: -Answer and Explanation: The correct answer is C. In an organism that has 36 chromosomes, at the end of meiosis I, each gamete contains 18 chromosomes, or 36 chromatids. Before meiosis, the chromosomes duplicate so that there would be 36 chromosomes, or 72 chromatids.

Detailed explanation-3: -If a cell having 36 chromosomes undergoes mitosis, two daughter cells will be produced, each containing 36 chromosomes. This is possible because DNA replication happens during interphase before the cell enters mitosis.

Detailed explanation-4: -The correct answer is C. The replicated chromosomes are still joined to their sister chromatids though; therefore, there are 36 chromatids.

Detailed explanation-5: -Chromosomes get divided in each cell during meiosis. The parent cell remains diploid in nature( 46 chromosomes in each cell) after meiosis I. After meiosis II, when each parent cell gets divided into two gametes each gamete cell contains 23 chromosomes.

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