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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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25. What is the importance of variations ?

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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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Advantages of selecting pea plant as experimental material

1. Many varieties were available with observable and contrasting characters.

2. Peas normally self pollinate so pure lines could be obtained for experimental purpose

3. It was easily available.

4 The life span of pea is short and it produced large number of offsprings

5. They were easy to cultivate and did not require much care.

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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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