Q22 of 167 Page 192

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

(B) Sex chromosomes are a pair of chromosome that decide/determine the sex of an individual. The 23rd pair of chromosome is Allosome (or sex chromosome).

There are 2 sex chromosomes (one pair). X and Y chromosome. Y chromosome is found only in males. X chromosome is found in both male and female


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21

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

 22

State one advantage of variation to a species.

 23

Explain how, sex is determined in human babies.

 24

What do the following symbols used in the topic on heredity represent?

(a) TT (b) tt


(c) XX (d) XY