What is chromosome ? How they help to decide the gender of a child

Dear Student,

Chromosomes are thread like structure made up of DNA and proteins. They are present inside the nucleus. Genes are located on the chromosomes in the form of linear array. Genes are responsible for the passage of characters from the parents to the offspring (inheritance). Genes also control the function important for life processes in the cells these functions are known as metabolic functions. As genes are located on the chromosomes, it can be said that chromosomes control inheritance and metabolism .

The second part of the question is beyond the scope of your present class. But as of now, just remember:
Sex of a child is determined by two genes X and Y.  XX represents a girl child and XY represents a boy child. 


You will learn further details in your higher classes. 

Regards
  

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sorry ,i don't know
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