NAME_____________________________

DATE__________

HOUR__________

DIRECTIONS: Solve the following problems using a punnett square!

1. A red carnation (RR) is crossed with a white carnation (rr) producing mostly pink carnations with a few reds and a few whites.

What inheritance pattern is at work here?____________________

Construct the punnett square of the cross here:

 

 

 

 

 

What is the genotypic ratio ______________________

What is the phenotypic ratio ______________________

2. A black labrador retriever is bred with a yellow labrador retriever. The litter included 2 black pups, 5 brown pups (sometimes called "chocolate labs") and 1 yellow pup.

What are the genotypes of the parents? ______________________

What are the genotypes of each of the pups: ______________________

Construct the Punnett Square here:

 

 

 

 

 

What is the genotypic ratio ______________________

What is the phenotypic ratio ______________________

3. In the human disorder Sickle Cell Anemia, and individual homozygous (SS) for the trait will only produce red blood cells that are irregular in shape and unable to carry oxygen. An individual who is heterozygous (Ss) for the trait (also called a carrier) will produce some irregularly shaped cells, but will produce enough normal red blood cells to function normally. Cross two carriers of Sickle Cell Anemia.

Construct the Punnett Square here: