AP BIOLOGY

LABORATORY REVIEW

MITOSIS AND MEIOSIS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A lion contains 80 chromosomes. The number of chromosomes a lion egg cell, produced by meiosis, will be?
A
40
B
80
C
20
D
60
Explanation: 

Detailed explanation-1: -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: -Thus, if a diploid cell contains 40 chromosomes, then the haploid cell will contain 20 chromosomes. During meiosis, a diploid cell undergoes two successive rounds of cell division to form four haploid cells.

Detailed explanation-3: -10 chromosomes Was this answer helpful?

Detailed explanation-4: -Thus if the chromosome number in a diploid zygote is 40, then it means the diploid organism has 40 chromosomes in total and this will reduce to its half at the time of gamete formation through meiosis. Therefore, the chromosome number in a gamete will be 20. So the correct answer is B. 20.

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