In humans hair type is determined by Incomplete dominance. Some people have curly hair some have straight hair and heterozygotes have wavy hair. What would occur if a person with wavy hair had a baby with a person with straight hair

In incomplete dominance, heter0zyg0us individuals express a mixture between the dominant and recessive phenotypes. In this cross, the child has 50% chance of having straight hair, and 50% chance of having wavy hair.

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Available data

A diallelic gene codes for type of hair
The gene expresses incomplete dominance
Phenotypes are curly hair, wavy hair, and straight hair.

Let us first review the framework about incomplete dominance.

In incomplete dominance cases, neither of the involved alleles completely dominates over the other one.

Heter0zyg0us descendants possess an intermediate phenotype between the dominant and recessive phenotypes.

Children born to a straight-haired parent and a curly-haired parent will have wavy hair as a mixture of both curly and straight traits.

Phenotype Genotype

Curly hair HH Dominant

Wavy hair Hh Mixture

Straight hair hh Recessive

Cross) a person with wavy with a person with straight hair

Parentals) Hh x hh

Gametes) H h h h

Punnett square) H h

h Hh hh

F1)

2/4 = 1/2 = 50% of the progeny is expected to have wavy hair expressing the heter0zyg0us genotype, Hh.

2/4 = 1/2 = 50% of the progeny is expected to have straight hair, expressing the h0m0zyg0ous recessive genotype, hh.

There is a probability of 50% for the child of a person with wavy hair and a person with straight hair to have straight hair, and 50% chances to have wavy hair.

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