In a dog breed known as the mexican hairless, the 'hairless' phenotype is a result of a mutation displaying an autosomal dominant pattern of inheritance. homozygous recessive individuals (hh) display a 'coated' phenotype. inheriting two copies of the mutation (hh) is lethal during embryonic development. in a cross between two dogs with the hairless phenotype, what proportion of live puppies born are expected to be hairless? give your answer in the form of a fraction.

Homozygous recessive genotype is hh (coated)

Homozygous dominant genotype is HH (lethal)

Heterozygous genotype is Hh (hairless)

If we cross two heterozygous:

P: Hh  x  Hh

F1: HH Hh Hh hh

½ of the offspring will be with hairless phenotype

¼ is with coated phenotype

¼ is lethal.

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