AP BIOLOGY

CELL DIVISION

MEIOSIS AND GENETIC VARIATION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
If a stem cell has 24 chromosomes, how many will it have at the end of meiosis?
A
24
B
12
C
6
D
the number varies per species
Explanation: 

Detailed explanation-1: -If a cell has 24 chromosomes before cell division then daughter cell resulting from mitotic division will have 24 chromosomes while daughter cell resulting from the meiotic division will contain 12 chromosomes each.

Detailed explanation-2: -So if a cell has 12 chromosomes at the end of meiosis I which is reduction division, it means that the parent cell would have had 24 chromosomes in prophase I. At the end of meiosis II (which is similar to mitosis and hence, equational division occurs) it would have 12 chromosomes.

Detailed explanation-3: -Complete answer: If a cell has 24 chromosomes and it undergoes mitosis to create two cells, then the daughter cells also have 24 chromosomes each. Mitosis is a process of division of cells where a parent cell divides into two daughter cells each of which is genetically just like the parent cell.

Detailed explanation-4: -Thus, the parent cell with 24 chromosomes after undergoing mitosis will form two daughter cells each with 24 chromosomes.

Detailed explanation-5: -At the G1 stage, the cell has 24 chromosomes. Each chromosome has a single chromatid for a total of 24 chromatids.

There is 1 question to complete.