REPRODUCTION
REPRODUCTION IN ORGANISMS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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2:1
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3:1
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1:2
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1:3
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Detailed explanation-1: -The human sperm and egg have 23 chromosomes each. So when they fuse together, the zygote formed has 23+23=46 chromosomes. So the required ratio is 46 : 23, i.e., 2 : 1.
Detailed explanation-2: -The number of chromosomes in a human sperm is half the number of chromosomes in a zygote, i.e., their ratio is 2 : 1.
Detailed explanation-3: -The ratio is 1:2 of chromosome number between an egg and its zygote. Sperms contain either X or Y chromosome whereas an egg will always have an X chromosome.
Detailed explanation-4: -Ratio. During mammalian spermatogenesis, meiosis produces 50:50 ratio of X and Y spermatozoa according to Mendelian segregation. Therefore, the natural sex ratio during spermatogenesis is expected to be 1:1 (Umehara et al., 2019).
Detailed explanation-5: -Normally, each cell in the human body has 23 pairs of chromosomes (46 total chromosomes). Half come from the mother; the other half come from the father.