Q2 of 47 Page 77

Does genetic combination of mothers play a significant role in determining the sex of a new born?

No, the genetic combination of mothers has no role in determining the sex of a new born baby. father is responsible for the sex of the baby which is born because only male has two types of sex chromosome names X and Y which will determine the sex of the foetus.


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25

Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fly. In the context of evolution this means that

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How is the sex of a newborn determined in humans?

 3

Mention three important features of fossils which help in the study of evolution.

 4

Why do all the gametes formed in human females have an X chromosome?