2. Although Watson and Crick are credited with the discovery of the structure of DNA, they based this discovery on the bench work of many other scientists of the tim(E) Name at least two different pieces of knowledge that Watson and Crick used in their discovery that was based on work from other scientists.

4. A couple wants to start a family, but they are concerned that their child might have cystic fibrosis, which is a recessive trait.. After taking a family history, you determine that while neither of them have the disease, the woman had a sister with cystic fibrosis (with unaffected parents), and the man's father also had cystic fibrosis. What do you tell them?

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