When alleles at a locus act in a semidominant fashionon fitness, the relative fitness of the heterozygote ismidway between the two homozygous classes. For example, genotypes with semidominance at the A locusmight have these relative fitnesses: wA/A = 1.0, wA/a =0.9, and wa/a = 0.8.a. Change one of these fitness values so that a /a becomes a deleterious recessive allele.b. Change one of these fitness values so that A/A becomes a favored dominant allele.
Genetic Variation
Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.
Quantitative Genetics
Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.
When alleles at a locus act in a semidominant fashion
on fitness, the relative fitness of the heterozygote is
midway between the two homozygous classes. For example, genotypes with semidominance at the A locus
might have these relative fitnesses: wA/A = 1.0, wA/a =
0.9, and wa/a = 0.8.
a. Change one of these fitness values so that a /a becomes a deleterious recessive allele.
b. Change one of these fitness values so that A/A becomes a favored dominant allele.
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