1. If a single daughter cell nucleus at the end of meiosis contains 40 nanograms

Question

1. If a single daughter cell nucleus at the end of meiosis contains 40 nanograms (ng) of DNA then

a) how many ng would have been present in one of the interkenesis nuclei?

b) how many ng would have been present in the otiginal mother cell nucleus during G2?

c) how many ng would have been present in the original mother cell nucleus during G1?

2. If daughter cell nucleus at the end of meiosis contains 84 unreplicated chromosomes, then

a) how many chromatids does it contain?

b) how many unreplicated chromosomes would have been present in one of the interkinesis nuclei?

c) how many unreplicated chromosomes would have been present in the mother cell nucleus during G2?

d) how many unreplicated chromosomes would have been present in the mother cell nucleus during G1?

3. If a mother cell nucleus has 48 chromosomes during G1, which account for 30 ng of DNA, then

a) during G2, how many chromatids are there in this nucelus?

b) how much DNA will this nucleus contain during G2?

c) immediately at the close of the subsequent meiotic equational division, how many chromatids will be found in one daughter nuclei?

d) immediately at the close of the subsequent meiotic equational division, how many chromosomes will be found in one daughter nuclei?

e) immediately at the close of the subsequent meiotic equational division, how much DNA will be found in one daughter nuclei?

Explanation / Answer

1. If a single daughter cell nucleus at the end of meiosis contains 40 nanograms (ng) of DNA then

mother cell(2n2C).........G1(2n2C)......G2(2n4C)..........meiosis1((1n2C).....interkinesis(1n2C)....meiosis2(1n1C)

....................80...............80................160......................80.........................80...........................40

a) how many ng would have been present in one of the interkenesis nuclei?

80 nanograms

b) how many ng would have been present in the original mother cell nucleus during G2?

40 x2 = 160 nanograms

c) how many ng would have been present in the original mother cell nucleus during G1?

80 nanograms

2. If daughter cell nucleus at the end of meiosis contains 84 unreplicated chromosomes, then

mother cell(2n2C).........G1(2n2C)......G2(2n4C)..........meiosis1((1n2C).....interkinesis(1n2C)....meiosis2(1n1C)

a) how many chromatids does it contain?

84 chromosomes (1n) with 84 chromatids ( each chromatid acts as a chromosome)

b) how many unreplicated chromosomes would have been present in one of the interkinesis nuclei?

(1n2C) i.e. 84 chromosomes

c) how many unreplicated chromosomes would have been present in the mother cell nucleus during G2?

G2(2n4C) = 168 chromosomes

d) how many unreplicated chromosomes would have been present in the mother cell nucleus during G1?

G1(2n2C) = 84 x 2 = 168 chromosomes

3. If a mother cell nucleus has 48 chromosomes during G1, which account for 30 ng of DNA, then

(mother cell(2n2C).........G1(2n2C)......G2(2n4C)..........meiosis1((1n2C).....interkinesis(1n2C)....meiosis2(1n1C)

...........48.........................48...........48........................24...............................24........................24............

............30.......................30............60........................30................................30......................15...........

a) during G2, how many chromatids are there in this nucelus?

G2(2n4C) i.e. 48 x 2 = 96 chromatids

b) how much DNA will this nucleus contain during G2?

30 ng DNA x 2 = 60 ng DNA

c) immediately at the close of the subsequent meiotic equational division, how many chromatids will be found in one daughter nuclei?

24 chromatids

d) immediately at the close of the subsequent meiotic equational division, how many chromosomes will be found in one daughter nuclei?

24 chromosomes

e) immediately at the close of the subsequent meiotic equational division, how much DNA will be found in one daughter nuclei?

15 ng of DNA (1n1C)

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