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Question
In a human child, sex is determined by_______.
In a human child, sex is determined by_______.
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Solution
The correct option is B sex chromosomes of the father
Male has two sex chromosomes X and Y. Hence, male produces sperms carrying either X or carrying Y chromosomes while the female has two X chromosomes. After fusion of the male and female gametes, the zygote would carry either XX or XY depending on whether the sperm carrying X or Y fertilized the ovum.
In case the ovum fertilises with a sperm carrying X - chromosome the zygote develops into a female (XX) and the fertilisation of the ovum with Y - chromosome carrying sperm results in a male offspring. Thus, it is evident that it is the genetic makeup of the sperm that determines the sex of the child.
Hence, the size and number of sperms and egg and sex chromosomes of the mother do not determine the sex of the child.
Male has two sex chromosomes X and Y. Hence, male produces sperms carrying either X or carrying Y chromosomes while the female has two X chromosomes. After fusion of the male and female gametes, the zygote would carry either XX or XY depending on whether the sperm carrying X or Y fertilized the ovum.
In case the ovum fertilises with a sperm carrying X - chromosome the zygote develops into a female (XX) and the fertilisation of the ovum with Y - chromosome carrying sperm results in a male offspring. Thus, it is evident that it is the genetic makeup of the sperm that determines the sex of the child.
Hence, the size and number of sperms and egg and sex chromosomes of the mother do not determine the sex of the child.
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