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In humans, hairy ears are controlled by a gene on the Y chromosome.
(a) Using letter YH to represent the chromosome carrying the gene for hairy ears, work out a cross between a hairy eared man and his wife.
(b) (i) What is the probability of the girls having hairy ears? (ii) Give a reason for your answer in (b) (i) above.
(c) Name two disorders in humans that are determined by sex linked genes.