6. 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?

Gap-fill exercise

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For a trait conditioned two alleles, for
example, and a, a balanced
between the alleles A bis more
advantageous for . For example,
in an situation in which
the homozygous phenotype becomes
incompatible life the presence of
good number of individuals and Aa
will result better survival chance for
species. Another example: an
situation in which the
phenotype becomes
incompatible with ; in this case the
of heterozygous and recessive
individuals in enough
number be fundamental for the
of the species.