In a given population, all humans have the same blood type O. If no other alleles for blood type exist in this population, this population is "fixed" for the O allele.

Question

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If all individuals in a population have the same allele for a particular gene, then the population is fixed for that allele. In this case, since all humans have the O blood type, this population is fixed for the O allele.

In a Given Population, All Humans Have the Same Blood