Q3 of 47 Page 77

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

Fossils are the preserved remains or impressions of living organisms that lived in the past.


Fossils helps:


(i) To trace the racial history of organisms.


(ii) To analyze the past climatic conditions.


(iii) To measure the geological time.


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1

How is the sex of a newborn determined in humans?

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

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

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In human beings, the statistical probability of getting either a male or female child is 50 : 50. Give a suitable explanation.