1. A homozygous black bird is crossed with a homozygous white bird. The two alleles are black (B) and white (W). The heterozygous genotype is expressed as bluish gray. (BW)
a. What is the phenotype of a bird with the genotype BB?
b. What is the phenotype of a bird with the genotype WW?
c. What is the phenotype of a bird with the genotype BW?
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Answer:
a. The phenotype of a bird with the genotype BB is a black-colored bird.
b. The phenotype of a bird with the genotype WW is a white-colored bird.
c. The phenotype of a bird with the genotype BW is a bluish gray-colored bird.
Explanation:
Genetics studies how genes or traits are being passed on from one generation to the next generation. Traits are expressed in genes. Genotype is the genetic material that is being passed on from one generation to the next. It is expressed by a pair of alleles. Alleles are the variant or alternative form of the gene. In the item, the alleles are B and W. Genotype can either be homozygous or heterozygous. Homozygous genes are made of identical alleles such as BB or WW. On the other hand, heterozygous genes are made of different alleles such as BW. Phenotypes are the observable traits of organisms like black, white, or bluish gray birds.
The color of the bird in the question is an example of incomplete dominance. It is a kind of inheritance wherein an intermediate phenotype is produced. It is known as partial dominance. The heterozygous gene will have a blend of the traits. Thus, heterozygous, BW, will produce a blend of black and white phenotype - which is bluish gray.
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