Troposphere
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The answer to this is genetic diversity. Genetic Diversity is the total number of genetic makeup of a species. It distinguished from genetic variability, which describes the tendency of genetic characteristics to vary. <span />
For example:
If both parents are with heterozygous genotype Aa (A is dominant allele for the trait and a is recessive allele for the trait) , than
P: Aa x Aa, the offspring will be
F1: AA Aa Aa aa (one dominant homozygous, one recessive homozygous and two heterozygous.