AP BIOLOGY

ANIMAL REPRODUCTION AND DEVELOPMENT

SEXUAL REPRODUCTION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
After meiosis, how many chromosomes does each cell have compared to the original cell?
A
double
B
equal
C
half
D
impossible to tell
Explanation: 

Detailed explanation-1: -At the end of mitosis, the two daughter cells will be exact copies of the original cell. Each daughter cell will have 30 chromosomes. 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-2: -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-3: -Each daughter cell will have half of the original 46 chromosomes, or 23 chromosomes. Each chromosome consists of 2 sister chromatids. The daughter cells now move in to the third and final phase of meiosis: meiosis II. At the end of meiosis I there are two haploid cells.

Detailed explanation-4: -Meiosis is part of the sexual process because gametes (sperm, eggs) have one half the chromosomes as diploid (2N) individuals. There are two divisions in meiosis; the first division is meiosis I: the number of cells is doubled but the number of chromosomes is not. This results in 1/2 as many chromosomes per cell.

Detailed explanation-5: -The parent cell undergoes one round of DNA replication followed by two separate cycles of nuclear division. The process results in four daughter cells that are haploid, which means they contain half the number of chromosomes of the diploid parent cell.

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