Red-green colorblindness is an X-linked trait. From which parent can a SON inherit the red-green colorblindness allele? O From his mother only From his father only From either his mother or his father.

Two brothers have thick hair that grows over their faces and most of their bodies. This human disorder, called Ambras Syndrome, shows x-linked dominant inheritance. The mother of the boys is also affected by Ambras Syndrome, although her excessive hair growth occurs in various, scattered patches on her skin rather than a continuous coverage like her sons. What is the most likely explanation for the patchy expression of hairlessness on the mother's skin? (2-3 sentences)

Colorblindness is an X-linked trait found in humans. What are the chances that a colorblind man will pass it on to his son? Please explain.

Hemophilia, disease in which the blood lacks a clotting factor, is caused by an X linked recessive gene. Joe doe not have hemophilia and Lucille is heterozygous for the condition.  What is the chance that their MALE child will have hemophilia? (Note: you are calculating the probability for their MALE children only, in other words if they have 1 male child, what is the probability that he will be born with the disease?)     0%     1/4 or 25%     2/4 or 50%     3/4 or 75%     4/4 or 100%