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Question : How is the sex of child determined in human beings ? |
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Answer» Solution :Determination of the sex of child. Sex chromosomes determine sex in HUMAN beings. In males, there are `44 + XY` chromosomes, WHEREAS, in female there are `44 + XX` chromosomes. Here, X and Y chromosomes determine sex in the human beings. TWO types of gametes are formed in male, one type is having `50%`, X-chromosome, whereas the other type is having Y-chromosome. In female, gametes are of one type and contain X-chromosome. The females are homogametic. If male gamete having Y-chromosome (androsperm) undergoes fusion with female gamete having X-chromosome the zygote will have XY chromosomes and this gives rise to male child. If the male gamete having X-chromosome undergoes fusion with female gamete having X-chromosome, the zygote will be having XX-chromosome and this gives rise to female child. |
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