AP BIOLOGY

CELL DIVISION

THE CELL CYCLE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
An organism has 50 chromosomes in its skin cells. How many chromosomes would its new daughter cells have?
A
50
B
25
C
100
D
45
Explanation: 

Detailed explanation-1: -Each daughter cell will have 30 chromosomes.

Detailed explanation-2: -Each daughter cell will have half of the original 46 chromosomes, or 23 chromosomes. Each chromosome consists of 2 sister chromatids.

Detailed explanation-3: -If a cell starts mitosis with 50 chromosomes then at the end of mitosis the daughter cells each have 25 chromosomes.

Detailed explanation-4: -Therefore, meiosis results in four haploid genetically unique daughter cells, each with half the DNA of the parent cell (Figure below). In human cells, the parent cell has 46 chromosomes (23 pairs), so the cells produced by meiosis have 23 chromosomes.

Detailed explanation-5: -When a diploid cell having 48 chromosomes divides, the four haploid daughter cells are produced at the end of meiosis II. Each daughter cell contains half of the chromosomes in number as that of the parent cell. Thus, it can be concluded that daughter cells produced from the parent cell will have 24 chromosomes.

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