Question

The DNA content of a cell is measured
in the G-2 phase. After meiosis-I, the DNA
content of one of the cells produced is
(a)Equal to that of the G-2, cell
b) Twice that of the G-2 cell
(c)1/2 that of the G-2 cell
d) 1/4 that of the G-2 cell​

Answer 1

Answer:

your answer is c

Explanation:

your answer is c

Answer 2

Answer:

c) The DNA content of a cell is measured in the G-2 phase. After meiosis-I, the DNA is 1/2 that of the G-2 cell.

Explanation:

Each of the following events affects the amount of DNA in a cell: fertilization, DNA synthesis, mitosis, and meiosis.

Let "c" be the amount of DNA and "n" be the number of chromosomes.

• The number of chromosomes is 1n, while the amount of DNA is 1c in a gamete.
• Both the DNA content and the number of chromosomes double after fertilization, to 2c and 2n, respectively.
• The DNA content doubles again to 4c following DNA replication in the synthesis phase, but each pair of sister chromatids is still counted as a single chromosome (a replicated chromosome), hence the number of chromosomes remains unaltered at 2n.
• For the G2 phase, the content remains the same. If the cell undergoes mitotic division, each daughter cell will revert to 2c and 2n, as it will get half of the DNA and one of each pair of sister chromatids.
• Similarly, during meiosis-I, the cell divides into two daughter cells, each of which receives half of the DNA and chromosomal content, i.e. 1n and 2c, respectively

Hence, the DNA content after meiosis-I is half that of the G-2 cell.