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Fur color in mice is affected by a gene with two alleles. The B allele causes dark brown fur and is completely dominant over the b allele that causes light brown fur. What is the fur color of a mouse with the genotype, Bb

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eyitbay

Answer:

Since this is heterozygote dominant state(Bb), and B allele is dominant over the b allele brown(b) ,hence the fur color must belong to the dominant allele which is dark brown.

Explanation:

Generally a dominant gene is the type that manifest itself from generations to generation irrespective of the presence of the recessive gene.

If there are two allele for fur colors (dark and light brown)

Therefore B(Dark brown) is a dominant allele,assuming with genotype BB.

while the recessive light brown (bb)

Therefore if the F1 generation is crossed the offspring are

Bb,Bb,Bb,Bb. These are hetero zygote dominants

Therefore the phenotype is dark brown.

marianaegarciaperedo

In Complete dominance, the dominant allele masks the expression of the recessive allele. Heter0zyg0us individuals, carrying both alleles, only express the dominant phenotype. The fur color of a Bb mouse is dark brown.

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Available data:

  • A diallic gene codes for fur color
  • B allele is dominant and codes for dark brown
  • b allele is recessive and codes for light brown
  • B allele is completely dominant over the b allele

The hint to answer this question is that The B allele causes dark brown fur and is completely dominant over the b allele. This sentence suggest that complete dominance is going on.

Complete dominance

  • When the dominant allele completely masks the recessive allele, we talk about complete dominance.

  • This is the case of individuals that are heter0zyg0us for a particular gene and express the dominant phenotype.

  • The dominant allele is hiding the expression of the recessive allele.

  • Many genes show complete dominance.

The mouse with the heter0zyg0us genotype Bb is carrying both alleles. However, the dominant allele B hides the expression of the recessive allele b.

This mouse expresses the dominant phenotyope dark brown.

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