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Transcript
The following is the pedigree of a trait contolled by recessive gene action. • For those traits exhibiting recessive gene action: • unaffected parents can have affected offspring • affected individuals can be male or female The following is the pedigree of a trait contolled by dominant gene action. • For those traits exhibiting dominant gene action: • affected individuals have at least one affected parent • the phenotype generally appears every generation • two unaffected parents only have unaffected offspring •A man and woman marry. They have five children, 2 girls and 3 boys. The mother is a carrier of hemophilia, an X-linked disorder. She passes the gene on to two of the boys who died in childhood and one of the daughters is also a carrier. Both daughters marry men without hemophilia and have 3 children (2 boys and a girl). The carrier daughter has one son with hemophilia. One of the non-carrier daughter’s sons marries a woman who is a carrier and they have twin daughters. What is the percent chance that each daughter will also be a carrier?
