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Heredity and Evolution

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Do all variations survive?

No, variations do not survive. Variations that are not suitable or advantageous to the organism in the prevailing environmental conditions are not maintained. Environmental factors act on these variants and the variant most suited to the existing environment would survive.
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The traits which express themselves in Ft generation are called _________.

dominant

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The phenotypic ratio in dihybrid cross is __________.

9 : 3 : 3 : 1
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The phenotypic ratio between tall and dwarf in F2 generation of monohybrid cross is _________.

3 : 1

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There are _______ pairs of chromosomes in human.

23

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The genetics is the science of __________ and __________.


heredity

,

variations

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