Free earlobes are dominant over attached earlobes. What is the probability that a woman with attached earlobes (homozygous recessive) will have children with attached earlobes if their father has free earlobes (heterozygous)?

The correct answer is explained below:

Explanation:

According to the question, free ear lobes are dominant over attached ear lobes.Let the allele for free ear lobes be represented by F.Let the allele for attached ear lobes be represented by f.The genotype of the homozygous recessive woman (mother) having attached ear lobes is : ff.The gamete produced by the woman is: f.The genotype of the heterozygous man (father) with free earlobes is: Ff.The gametes produced by the man are: F and f.Mating the man with the woman we get the following offspring,

                                        F                                            f

                           f           Ff                                          ff

          Phenotype      Free ear lobe                   Attached ear lobe

The genotype and the phenotype of the probable children obtained is represented in the Punnett square above.The probability that the parents would produce children with attached ear lobes is = .