A particular gene in dogs contributes to coat color. The two alleles exhibit incomplete dominance.  Dogs with genotype mm have normal pigmentation; genotype Mm leads to “dilute” pigmentation; genotype MM produces an all-white dog.  If a breeder mates a normal dog with a white dog, what will be the genotypes and phenotypes of the puppies?  If two Mm dogs are mated, what is the probability that a puppy will be white?

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Asked Nov 1, 2019
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  1. A particular gene in dogs contributes to coat color. The two alleles exhibit incomplete dominance.  Dogs with genotype mm have normal pigmentation; genotype Mm leads to “dilute” pigmentation; genotype MM produces an all-white dog.  If a breeder mates a normal dog with a white dog, what will be the genotypes and phenotypes of the puppies?  If two Mm dogs are mated, what is the probability that a puppy will be white?
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Expert Answer

Step 1

According to Mendelian inheritance, every trait is influenced by a pair of alleles and these alleles can be either dominant or recessive. Usually, dominant allele masks the expression of recessive allele and expresses itself whereas recessive allele is expressed only in the absence of dominant allele. Incomplete dominance is a special case in which the recessive allele is not completely suppressed. As a result, the resulting phenotype is an intermediate or combination of both the alleles.

Step 2

It is given that MM results in white dog, mm results in normal pigmentation whereas Mm produces dogs with dilute pigmentation. Thus, Mm had resulted due to incomplete dominance.

If a normal dog (mm) is mated with white dog (MM), the genotype of the resulting offspring would be Mm, which produces dogs with dilute pigmentation.

 

If Mm dogs were mated, all three combinations of ...

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