3. In pea plants, purple flowers (FF) is dominant and white flowers (ff) are rec

Question

3. In pea plants, purple flowers (FF) is dominant and white flowers (ff) are recessive. A pea plant with purple flowers is crossed with a pea plant with white flowers. The resulting offspring have about equal numbers of purple and white flowered plants. What are the genotypes of the parents? 4. Suppose a newborn baby was accidnetly mixed up in the hospital. In an effort to determine the parents of the baby, the blood types of the baby and two sets of parents were determined. Mrs. Longbottom had type B Mrs. Granger had type B Mr. Longbottom had type AB Mr. Granger had type B Baby 1 had type O a. Draw a Punnett square for each couple (you made need to do more than 1 square/couple). Remember what makes the different types of blood types b. To which parent does baby 1 belong? Why? Hint you may want to refer toyour Punnett squares 5. Dimpled cheeks are dominant to undimpled cheeks. If there exists a 50 percent change that a child will have dimpled cheeks, what are the parental genotypes?

Explanation / Answer

3.

Purple = Dominant = FF or Ff

White = Recessive = ff

Parental cross: Ff X ff

Progeny = Ff Ff ff ff

Phenotypic ratio = 1 (Purple) : 1 (Green)

4.

Baby = OO

If a parent has AB blood group, his/her progeny can not contain O-blood group.

a.

i. BB/BO X BB/BO

Progeny: BB BO OO

The baby belongs to these parents.

ii. BB/BO X AB

Progeny: AB BB AO BO

b. BB/BO X BB/BO

Progeny: BB BO OO

The baby belongs to these parents.

5.

Dimpled chin = Dominant = DD or Dd

Undimpled chin = Recessive = dd

Parental cross: Dd X dd

Progeny: Dd Dd dd dd

Phenotypic ratio = 1 (dipled chin) : 1 (Undimpled chin)

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