In humans, B is the allele for brown eyes and b is the allele for blue eyes. Two brothers both have brown eyes, but one of them has both the B and b  alleles while the other only has B  alleles. Which statement is true about the brothers?
answer choices
They have the same genotype and phenotype.
They have different phenotypes and genotypes.
They have the same phenotype but different genotypes.
They have the same genotype but different phenotypes.

Question

16-12-2022
Biology

Answered

In humans, B is the allele for brown eyes and b is the allele for blue eyes. Two brothers both have brown eyes, but one of them has both the B and b  alleles while the other only has B  alleles. Which statement is true about the brothers?
answer choices
They have the same genotype and phenotype.
They have different phenotypes and genotypes.
They have the same phenotype but different genotypes.
They have the same genotype but different phenotypes.

Answer :

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bharathparasad577 bharathparasad577 · Answer 1 · 2022-12-20T00:48:32-05:00

Option C is correct . Two brothers will be having the same phenotypes of Brown eyes but the different genotypes.

The genotype is determined by the alleles a person has in combination for a certain gene. The genotype is determined by the alleles a person has in combination for a certain gene. A person will be genetically heterozygous for certain traits, such as eye color, if they inherit a dominant brown allele (B) and a recessive blue allele (b). Due to the dominance of one allele, the individual will have brown eyes.

But the phenotype refers to the characteristics that may be seen in an organism. In contrast to the genotype, it is not passed down from the parents.

One brother is having both b and B alleles, so its genotype is Bb abd other has only B allele so its genotype will be BB. Since B allele is dominant both have brown eye color hence their phenotypes will be same.

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