Q33 of 167 Page 192

What is meant by 'heredity' ? What are the units of heredity?

(A) Heredity refers to passing on of traits/characters genetically from parents to offspring.

The units of heredity are genes which are found on chromosomes. Chromosomes are organized structures of DNA and protein and are found in the nucleus.


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31

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

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Give the contrasting traits of the following characters in pea plant and mention which is dominant and which is recessive:

(a) Yellow seed (b) Round seed

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State Mendel's first law of inheritance.

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Why did Mendel choose pea plants for conducting his experiments on inheritance?