Review questions, Nov 13

 

Work on these questions before Nov 13 class.

 

1. Pea flowers may be purple (W) or white (w). Pea seeds may be round (R) or wrinkled (r). Assuming that these genes are not linked, what proportion of the offspring from the cross WwRr x WwRr will have white flowers and wrinkled seeds? 

a.      1/2       b. 3/4              c. 3/16            d. 1/4              e. 1/16

 

2. A red bull is crossed with a white cow and all of the offspring are roan, a shade between red and white. This is an example of genes that are _____. 

a.      linked              b. codominant            c. dominant    d. incomplete dominant

e. recessive

 

3. A man who has type B blood and a woman who has type A blood could have children of which of the following phenotypes?

a.      A or B             b. AB              c. A, B or AB              d. A, B, AB or O        e. O

 

4. Persons with type AB blood can donate their blood to____.

a.      A or B             b. only AB       c. A, B or AB              d. AB, A , B and O    e. O

 

5. A single allele that controls more than one character is said to be _____.

a.      pleiotropic      b. polygenic   c. codominant            d. incomplete domincant

 

6. In a particular species of mammal, black hair (B) is dominant to green hair (b), and red eyes (R) are dominant to white eyes (r). When a BbRr individual is mated with a bbrr individual, the observed distribution of offspring was: black-red 1,070; black-white 177; green-red 180; green-white 1,072.  What is the recombination frequency?

 

 

 

7.  Based on the table below, predict the physical map of genetic loci A, B and C.

 

genetic loci	recombination frequency (%)
A and B	10
B and C	15
A and C	5