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Which type of lethal, inheritable allele is most likely to persist in a population?
  • a)
    Dominant
  • b)
    Codominant
  • c)
    Recessive
  • d)
    Incompletely Dominant
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Which type of lethal, inheritable allele is most likely to persist in ...
Recessive Lethal Allele: A recessive lethal allele is one that is expressed phenotypically only when an individual inherits two copies of the allele (one from each parent). This means that individuals who carry only one copy of the recessive lethal allele (referred to as carriers) do not exhibit the lethal phenotype and can lead normal lives, reproduce, and pass on the allele to their offspring.
Heterozygous Carriers: Heterozygous carriers of a recessive lethal allele have one copy of the normal allele and one copy of the recessive lethal allele. Since the normal allele is dominant over the recessive lethal allele, carriers do not show any negative effects. As a result, carriers have equal chances of survival and reproductive success as individuals without the allele.
Persistence in the Population: The recessive lethal allele can persist in the population through generations because carriers, who are phenotypically normal, can pass on the allele to their offspring without any negative effects on their own fitness. In each generation, some individuals will inherit the recessive lethal allele from their carrier parents, but they will only exhibit the lethal phenotype if they inherit two copies. This "hidden" nature of the allele in carriers allows it to remain in the gene pool over time.
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