Biology Questions and Answers
expressiveness may be influenced by
the environment.
- Why is a balanced
frequency of different alleles
of a gene in a population more
useful for the survival of that
population facing
environmental changes?
For a trait conditionexample, A and a, a balanceed by two d frequencyalleles, for
between the alleles A anadvantageous for survival. For ed b is morxample,e (^)
in an environmental situation in which
the aa homozyincompatible with gous plife the presence of ahenotype becomes
good number of individuals AA and Aa
will result in better suthe species. Another examplervival chance for: an
environmental situation in which the
dominant phenotype becomincompatible with life; in this case thes (^) e
existence of heterozygous and recessive
homozynumber may gous individuals in enoughbe fundamental for the (^)
survival of the species.
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