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 genetics is the science of __________ and __________.


heredity

,

variations

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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 traits which express themselves in Ft generation are called _________.

dominant

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