Answer to Question #112932 in Genetics for Dana

Question #112932

Genetic Problems: It may be difficult to do the Punnett Squares to hand in on the answer sheet. Therefore, for the following problems, work them out on scrap paper and only place the answers asked for on the answer sheet.
13. Cystic fibrosis is inherited as an autosomal recessive trait. If a woman carries the trait marries a normal male who does not carry the trait, what are the chances that any of their children will have the disease?
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14. In peas, tall is dominant over short and smooth seed dominant over rough. Cross a tall rough plant with a short smooth plant.
A. On the answer sheet, write down the genotypes of the parents.

B. From this cross, could any short rough offspring be produced?

Expert's answer

A) Aabb or AAbb (tall rough); aaBb or aaBB (short smooth)

B) short smooth – aabb

Short smooth can be produced only if parents genotypes are Aabb and aaBb