In humans, the allele for normal opsins in the cones of the eyes, C, is dominant to the allele for colour- blindness, c. The trait is X-linked. A woman who is not colour-blind has a father who is colour-blind. If this woman has a child with a man who is colour-blind, what is the probability of them having a colour-blind son? Your response must include a Punnett square with correct nomenclature. Express your answer as a frequency between 0-1.

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.

The remaining questions go together. In a species of collared lizard (Crotaphytus collaris), long tail (T) is dominant to short tail (t), and green scalation (G) is dominant to brown scalation (g). Both tail length and scale color are autosomal traits. But green scalation is a x-linked"-limited trait only expressed in males – females have brown scales regardless of G/g genotype. In addition, T is a recessive lethal allele – TT homozygotes do not develop. A long-tailed brown male mates with a long-tailed brown female. Their first two viable offspring are a short-tailed green male a long-tailed brown male. What is the genotype of the father?       ["", "", "", "", ""]  What is the genotype of the mother?       ["", "", "", "", ""]  What is the genotype of the short-tailed green male?       ["", "", "", "", ""]  What is the genotype of the long-tailed brown male?

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%