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Biology
4. Heredity and Evolution
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Q22 of 167 Page 192

State one advantage of variation to a species.

(A) Variations are heritable differences within individuals of a species. Advantage- Nature always selects the fittest organism so if no variation occurred in genes there would not have been so many species of the organism. In a changing environment, variation always increases the chances of survival of a species.


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20

Name an animal in which individuals can change sex. What does this indicate?

21

Explain with an example, how genes control the characteristics (or traits).

22

What are sex chromosomes? How many sex chromosomes are there? Name them.

23

Explain how, sex is determined in human babies.

Questions · 167
4. Heredity and Evolution
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