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Question : How is sex determined in human beings ? |
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Answer» Solution :In HUMANS out of 23 pairs of chromosomes present 22 pairs are exactly same in both males and females known as AUTOSOMES. = The 23rd pair of chromosome is the sex chromosome i.e. a pair of X-chromosome (XX) is present in females and males having one X and Y chromosome (XY). = During spermatogenesis, in case of male, TWO types of gametes are PRODUCED = The 50% of total sperms produced carry X-chromosomes and the rest 50% carry Y-chromosomes besides autosomes. =Female produces only one type of ovum with an X-chromosome. = If an ovum fertilises with a sperm carrying Xchromosome the zygote develops into female [XX) and if an ovum is fertilised with sperm carrying Y-chromosome zygote thus formed will be male XY.  = Hence, the genetic MAKE up of sperm, which fertilises the ovum determines the sex of a child. = These are 50% chances of having either a male or female in each pregnancy. |
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