Explain how a man who has red-green colour-blindness rarely fathers a son who also possesses the trait.

2) Hemophilia is a relatively rare recessive sex-linked trait in humans. Say that a man with hemophilia marries a woman who is homozygous normal (does not have hemophilia). Let XH be the norman gene and Xh be the recessive gene. Draw a punnett square illustrating this cross, and then answer the following question. a) What type or types of gametes can the father produced? b)what type or types of gametes can the mother produce? c) What is the probability that their daughters will be carriers of the gene for hemophilia (but not show the trait themselves)? d) What is the probability that their daughter will have hemophilia? e) What is the probability that their sons will be carrier of the gene for hemophilia ( but not show the trait themselves)? f) what is the probability that their sons will have hemophilia? 3) A colour-blind man (CcY) marries a woman with normal vision whose father is colour-blind. Show the gametes of the woman and the woman and complete a punnett square to illustrate this cross. Then answer the following question. a) what type or types of gametes can father produce? b) what type or types of gametes can mother produce? c) What is the probability that thier daughter will be carriers of the gene for colour-blindness ( but not show the trait themselves)? d) What is probability that their daughter will be colour-blind? e) what is the probability that their sons will carriers of the gene for colour-blindness (but not show the trait themselves)? f) what is the probability that their sons will be colour-blind? 4) A man with hemophilia marries a woman who is a carrier for the gene. Show the gametes of the man and the woman, and complete a punnett square to illustrate this cross. Then answer the following questions. a) what type or types of gametes can the father produce? b) What type or types of gametes can the mother Produce? c) what is the probability that their daughters will be carriers of the gene for hemophilia ( but not show the trait themselves)? d) what is the probability that their daughter will have hemophilia? e) What is the probability that their sons will be carriers of the gene for hemophilia (but not show the trait themselves)? f) What is the probability that their sons will have hemophilia?

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