In human beings the satistical possibility

Question:

In human beings the satistical possibility of getting either a male or female child is 50 : 50. Give suitable explanation.

Solution:

Human females (44 + XX) are homogametic, that is, they produce only one type of ova (22 + X). Human males are heterogametic. They produce

two types of sperms (22 + X and 22 + Y) in equal proportion, that is, 50 : 50 ratio. The chance of male or female child is also 50 : 50, as there is

equal chance of androsperm (22 + Y) or gynosperm (22 + X) fertilizing an ovum.

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