The ratio of number of chromosomes in a human zygote and a human sperm is:(a) 2:1 (b) 3:1 (c) 1:2 (d) 1:3
Correct Answer: (a) 2:1
Explanation:
Human sperm and egg cell being a germ cell are haploid in nature. They contain 23 chromosomes.
When sperm cell and egg cell fuse together during fertilization, it forms zygote which is diploid in nature.
Therefore,
23 chromosomes (sperm cell, n) + 23 chromosomes (egg cell, n) = 46 chromosomes (zygote);
or 23 pair of chromosomes (zygote, 2n).
Therefore, the ratio of the number of chromosomes in the human zygote and human sperm cell = 46/23
The answer is 2:1.
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