The alternate variation form of the genes is called alleles. The alleles can be dominant or recessive. The pair which is correctly matched is aa - genotype; red feathers - phenotype. Thus, option D is correct.
What are phenotype and genotype?
The phenotype and genotype are used to show the physical and the genetic characteristic of the organisms. The phenotype is the observable and detectable trait inherited by reproduction.
The genotype is the genetical sequence of the organism that is expressed by the traits. It includes the whole information of the inheritance. It is expressed in the form of dominant and recessive variants.
The genotype for the cross between the chicken can be shown by, "aa" as it is the recessive allele. The phenotype is the morphological property that is visible to the eyes and is "red feathers" as purebred recessive allele codes for red feathers.
Therefore, option D. aa - genotype; red feathers - phenotype is the correct match.
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