21.How will you find out whether a given plant is homozygous dominant or heterozygous dominant ? Explain
By test cross, i.e. crossing the given plant with recessive parent. When the dominant plant is crossed with a recessive parent the progeny can be analysed to determine the genotype of the dominant individual. If the progeny formed are 50% tall and 50 % dwarf then the genotype of the individual is heterozygous. If all the progeny are tall then the individual has homozygous genotype.
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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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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
(c) Monohybrid and dihybrid.
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30.
Explain the law of dominance using a monohybrid cross.
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