1What type of data is analyzed using a chisquared 2 test con

1.What type of data is analyzed using a chi-squared (?2) test?

continuously varying measurements

categories

counts

all of the above

2

The rest of the questions are based on the following scenario. You have guinea pigs from two pure breeding lines. One line has black fur and red eyes the other line has white fur and blue eyes. When you cross them, all the F1 guinea pigs have black fur and blue eyes. When you cross the F1s to one another you get a total of 50 F2 offspring. There are 31 with black fur and red eyes, 15 with white fur and blue eyes, 2 with white fur and red eyes, and 2 with black fur and blue eyes. There are approximately equal numbers of males and females in each phenotypic category.

Which alleles are dominant?

black, red

black, white

black, blue

white, blue

3.

Based on what you know, what kind of cross is being done here?

autosomal monohybrid cross

autosomal dihybrid cross

sex-linked monohybrid cross

sex-linked dihybrid cross

4.

What is the expected phenotypic ratio in the F2 assuming independent assortment?

3:!

9:3:3:1

1:1:1:1

1:1

5.

If you were to do a ?2 test on these data what would the expected value be for individuals with white fur and blue eyes?

15

12.5

9.375

3.125

Solution

1.Chi-squared test is for categories of data

?2.black, red

3.autosomal dihybrid cross

4.9:3:3:1

5.12.5