1 Two genes are on the same chromosome Will these two genes

1. Two genes are on the same chromosome.

Will these two genes follow independent assortment?_______ Why or why not?

2. In cats, curled ears (E) is dominant over normal ears (e). On a different chromosome, Black color (B) is dominant over gray (b). A cross is made between cats EeBb x eeBb.

a) Give the gametes each can make.

b) Do the Punnett Square for this cross on the back.

c) Give the phenotypic ratios for

            Curled Ears & Black Color ___/16

Curled Ears & gray color ____/16

            normal ears & Black Color ___/16

normal ears & gray color ____/16

3. Over the years, 84 kittens were born to these cats. There were 33 with curled ears and black color, 9 with curled ears and gray color, 12 with normal ears and gray color and 30 with normal ears and black color.

a) Calculate the Chi-Square for these kittens on the back.

b) Were the observed results expected or not?

4. How many different gametes would be made by each of the following individuals?

a) Ss

b) AaGg

c) BbCcDd

d) How many independently assorting genes would you be observing if there are 2⁵ gametes?

            (Read this carefully)

Solution

Genes present on the same chromosome are said to be linked and do not assort independently. Genes physically located close to each other on the same chromosome tend to be inherited together. However due to the process of recombination, the genes present on the same chromosome can behave as independent genes.