. The father is responsible for the sex of a child, not the mother. Justify this statement


Best Answer

Ans.    (i) A male  has one X-chromosome and  one Y-chromosome. Thus  half the male gametes have  X-chromosomes and  the other  half  have  Y-chromosomes.       

(ii) A  female   has   two   X-chromosomes.  Thus   all   female   gametes  have   only   X­ chromosomes.

(iii) If a sperm carrying Y-chromosome fertilises an ovum carrying X-chromosome, then the child  born  will be a boy.          

(iii) If a sperm carrying X-chromosome fertilises an ovum carrying X-chromosome, then the child  born  will  be a girl. 

 

 

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