GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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that are both dominant and recessive
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they have incompete dominance
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They have codominance
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None of the above
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Detailed explanation-1: -For example, if one parent is homozygous dominant (WW) and the other is homozygous recessive (ww), then all their offspring will be heterozygous (Ww) and possess a widow’s peak. If both parents are heterozygous (Ww), there is a 75% chance that any one of their offspring will have a widow’s peak (see figure).
Detailed explanation-2: -When true-breeding, or homozygous, individuals that differ for a certain trait are crossed, all of the offspring will be heterozygous for that trait. If the traits are inherited as dominant and recessive, the F1 offspring will all exhibit the same phenotype as the parent homozygous for the dominant trait.
Detailed explanation-3: -In genetic theory, all the progeny should have white feathers because WL is homozygous autosomal dominant for white feathers. However, we found a few red-feathered female chickens.
Detailed explanation-4: -The genotype of offsprings will be BW. The color of feathers will be black and white as both alleles express in the phenotype and neiter of tese two alleles is able to dominate over the other. The feather color in chicken in question exhibits the phenomenon of incomplete dominance.