Q20 of 167 Page 192

Name the scientist who gave the laws of inheritance.

(A) Gregor Johann Mendel gave the laws of inheritance. He studied heredity on pea plants and gave three laws of inheritance. 1. Law of Dominance. 2. Law of segregation. 3. Law of independent assortment.


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18

Which of the following represent tall plants and which represent short plants (or dwarf plants)?

(a) Tt (b) tt (c) TT


Give reason for your choice (The symbols have their usual meaning).

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A man having blood group 0 marries a woman having blood group B and they have a daughter. What will be the blood group of the daughter?

 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).