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21. How will you find out whether a given plant is homozygous dominant or heterozygous dominant ? Explain

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22. A diploid organism is heterozygous for 4 loci, how many types of gametes can be produced ?

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23. Who proposed the chromosomal theory of inheritance ?

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24. What are the two causes of variations in DNA?

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Importance of variations.

1. They enable the organism to adapt themselves to changing environment.

2. They form raw material for evolution and development of new species.

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26. How did Mendel make sure that the plants were true breeding ?

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27. Make a table showing characters of pea selected by Mendel.

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28. Mention the advantages of selecting pea plant for experiment by Mendel.

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29. Differentiate between the following :

(a) Dominance and Recessive

(b) Homozygous and heterozygous

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30.

Explain the law of dominance using a monohybrid cross.

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