Q.137
If a pollen mother cell (PMC) contains 20 tetrads in prophase
I stage, then what will be the number of chromosomes in
each daughter cell at the end of meiosis I and meiosis II
respectively?
Choose answer:
40, 20
©
20,20
20,10
40,40
Answers
Answered by
3
Answer:
20 and 10
Explanation: In meosis I chromosome number remains same as that of diploid cell but get half in meiosis II
Answered by
1
20,20
Explanation:
A tetrad is a four-part DNA structure formed during the prophase of Meiosis I during which crossing over or recombination takes place.
A tetrad structure is composed of four chromatids, in which two sister chromatids form a chromosome thus to homologous structures are formed.
Therefore,
- A tetrad contains- 4 chromatids = 2 homologous chromosomes Thus,
- 20 tetrads- 20 x 4= 80 chromatids = 20 homologous pair of chromosome
- 20 homologous pair of chromosome= 40 chromosomes.
- Therefore a cell contains 20 homologous pair of the chromosome.
- During meiosis I homologous chromosome separate thus, two daughter cell will be formed with 10 homologous chromosomes or 20 chromosomes.
- During meiosis II, chromatids of chromosome separate thus four daughter cells with 20 chromosomes will be formed.
Thus, 20,20 is the correct answer.
To learn more:
1. function of meiosis- https://brainly.com/question/1271878
2. stages of meiosis- https://brainly.in/question/3302629
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