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प्रश्न
Write a short note on sex determination in man.
उत्तर
The difference between two individuals of the same species with respect to heredity is known as sex. So, an individual can either be a male or female in normal circumstances. Scientists have discovered that sex is transmitted by definite sex determination, also called heterosomes. The human body cells have two sex- chromosomes. A woman has two X- chromosomes while a man has one X- chromosome and one Y-chromosome.
Therefore, an egg cell has one X- chromosome and a sperm cell have either an X- or a Y-chromosome. This means that the sex of a baby is determined by the type of sperm cell fertilizing the egg. If an egg, fused with a sperm having Y-chromosome, then the male zygote will develop and when fused with a sperm having an X-chromosome then a female zygote will develop.
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संबंधित प्रश्न
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