When the homozygous takes over the population, it is known as fixation. But it can happen for other reasons, for example, the dominant trait expresses red coloration in a bird, which makes it more evident for predators, leading it to extinction. An example of that would be Huntington's disease. That can happen if the dominant trait happens to be a dominant lethal, where the dominant trait effectively kills the individual.
In your scenario, the recessive homozygous, aa take over the population and never with either AA or Aa. AA and aa are called homozygous (zygote with same alleles), Aa is called heterozygous (zygote with different alleles). It means that a certain trait will always express itself in the presence of other allele.įollowing a simple distribution of two alleles, A and a, where A is dominant and a is recessive, we have the following possible pairings: AA, Aa, which will express A, and aa, which is the only instance where a will be expressed. Something to remember is that dominant trait doesn't mean it's a beneficial trait.
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