A Mutation Expressed Only Under Certain Conditions Is
Overdominance is a condition in genetics where the phenotype of the heterozygote lies outside. The term epigenetics was first introduced in 1942 by Conrad Waddington to describe the interactions of genes with their environment which bring the phenotype into being.
The specific case of heterozygote advantage due to a single locus is known as overdominance.
. 3 Today epigenetics refers to modifications of the genome that do not involve a change of DNA sequence ie the As Cs Gs and Ts that code information in DNA. A heterozygote advantage describes the case in which the heterozygous genotype has a higher relative fitness than either the homozygous dominant or homozygous recessive genotype.
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