Lecture 7

Question 1

Define monohybrid cross.

Answer 1

1 trait w/ diff. alleles
eg. color

Question 2

What is the PHENOTYPIC ratio of a monohybrid cross?

Answer 2

3:1

Question 3

What is the GENOTYPIC ratio of a monohybrid cross?

Answer 3

1:2:1

Question 4

What is a dihybrid cross?

Answer 4

2 independent traits w/ diff. alleles
eg. color and shape

Question 5

What is the GENOTYPIC ratio of a dihybrid cross?

Answer 5

1:2:2:4:1:2:1:2:1

Question 6

What is the PHENOTYPIC ratio of the dihybrid cross?

Answer 6

9:3:3:1

Question 7

Define test cross.

Answer 7

to test an unknown breed with a homo. recessive

Question 8

Chi-Squared Value Formula

Answer 8

x^2= (observed-expected)^/expected

Question 9

When do you “REJECT” the null hypothesis?

Answer 9

When the p-value is less than 0.05

Question 10

When do you “FAIL TO REJECT” the null hypothesis?

Answer 10

When the p-value is greater than 0.05

Question 11

What does accepting “fail to reject” the null hypothesis reveal about the data?

Answer 11

observed is not close to the expected, results are not significant enough to determine a relationship

Question 12

What does rejecting the null hypothesis reveal about the data?

Answer 12

There is a relationship between o & e
results ARE close to the expected, results are significant

Question 13

Define simple recessive trait.

Answer 13

a trait that needs 2 copies of the recessive allele to show the phenotype

Question 14

Define null hypothesis.

Answer 14

Null hypothesis= no relationship