How many pair of chromosomes are sex chromosomes?

• 3

• 4

• 2

• 1

What combination of sex chromosomes do men have

• XX

• YX

• XY

What combination of sex chromosomes do women have?

• XX

• YX

• XY

What is the probability of having a boy in any given pregnancy?

• 25%

• 50%

• 75%

• 100%

In fruit flies, eye color is sex linked. XR is for red eyes and Xr is for white eyes. Cross a white eyed male with a normal red eyed female. What percentage of males with have red eyes?

• 0%

• 50%

• 100%

In fruit flies, eye color is sex linked. XR is for red eyes and Xr is for white eyes. Cross a white eyed female with a red eyed male. How many children will have white eyes?

• 0%

• 25%

• 50%

• 100%

• 75%

In fruit flies, eye color is sex linked. XR is for red eyes and Xr is for white eyes. Cross a white eyed female with a red eyed male. How many girls will have white eyes?

• 0%

• 50%

• 100%

In fruit flies, eye color is sex linked. XR is for red eyes and Xr is for white eyes. Cross a heterozygous red eyed female with a white eyed male. What percentage of their children will have white eyes?

• 0%

• 25%

• 50%

• 75%

• 100%