AP BIOLOGY

CELL DIVISION

THE CELL CYCLE

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

If an organism starts with one cell and this cell has 10 chromosomes ____ how many CELLS will there be after cell division?

A	1
B	2
C	10
D	20

Explanation:

Detailed explanation-1: -10 chromosomes each. Mitotic division results in two daughter cells with an identical chromosomal number and genetic content to the parental cell.

Detailed explanation-2: -So, the haploid chromosome number will be= 10/2= 5. The number of possible chromosome pairs is given by= 2n, where n is the haploid chromosome number. So, the number of chromosome pairs for having a diploid chromosome number of 10 will be= 25. So, the correct answer is ‘25’.

Detailed explanation-3: -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.

Detailed explanation-4: -If a nucleus has ten chromosomes after replication, the cell will have only five chromatids. This is because each chromatid is made up of a pair of replicated chromosomes, which exist as sister chromatids during prophase and metaphase stages of the cell cycle.

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