AP BIOLOGY

CELL DIVISION

MEIOSIS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
If the daughter cells each have 16 chromosomes after cell division, what was the number of chromosomes in the parent cell? See Figure M-2.
A
16
B
6
C
32
D
4
Explanation: 

Detailed explanation-1: -Thus it is also known as reductional division. So, if the parent cell has 16 chromosomes, after meiotic division it will get reduced to half and thus, the daughter cells will have 8 chromosomes.

Detailed explanation-2: -Each daughter cell receives only half the number of chromosomes from the parent cell. At this stage, a diploid cell with 16 chromosomes will have 8 chromosomes in the daughter cells.

Detailed explanation-3: -At the end of meiosis II, each cell (i.e., gamete) would have half the original number of chromosomes, that is, 15 chromosomes.

Detailed explanation-4: -Onion root tip cells have 16 chromosomes in each cell.

Detailed explanation-5: -It is given that the number of chromosomes present in each onion root tip cell is 16. Hence, the number of chromosomes in the cell will be 16 at G1 phase, after S phase and after M phase. Also, if the DNA content after M phase is 2C. Hence, the DNA content at G1 phase will be 2C.

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