brown eyes (B) are dominant over blue. A brown eyed man marries a blue-eyed (b) woman and they have three children two of whom are brown-eyed and one of whom is blue-eyed. if the male has brown eyes but has a blue-eyed child, what must his genotype be

In humans, free ear lobes (E) is dominant over attached ear lobes (e), and brown eyes (B) is dominantover blue eyes (b). A man with free ear lobes and brown eyes marries a woman with attached ear lobes andbrown eyes. Of four children, one has free ear lobes and brown eyes, one has free ear lobes and blue eyes,one has attached ear lobes and brown eyes, and one has attached ear lobes and blue eyes. Determine thegenotypes of the parents.

The Delacour family is descended from the Veela race, a semi-human, semi-magical humanoid people reminiscent of the Sirens in Greek mythology with special powers. Imagine that being a Veela and having these powers is a X-Linked Dominant trait that is passed on genetically.   (Hint: Use the Punnett Square.) What are the possible genotypes for Fleur and Bill’s daughter, Victoire?       What are the genotypic frequencies related to the female children (in percentage format)?       What is the likelihood (in percentage format) that Victoire would express Veela powers?

A human female who is heterozygous for the recessive, sex-linked trait causing red-green color blindness, marries a normal male. What proportion of their male progeny will have red-green color blindness?