Ch 12-1 review

I have 2 X chromosomes. What am I?

• Male

• Female

I have 1 X chromosome and 1 Y chromosome. What am I?

• Male

• Female

If a gene is found only on the X chromosome and not the Y chromosome, it is said to be what?

• sex-linked trait

• polygenic trait

• codominant trait

• incomplete dominance trait

What percentage of the offspring will have this recessive disease?

• 0%

• 25%

• 50%

• 75%

What percentage of the female offspring will be a carrier for this recessive disease?

• 0%

• 50%

• 100%

• 25%

How many PAIRS of chromosomes do humans have?

• 23

• 46

• 1

• 2

How many PAIRS of sex chromosomes do humans have?

• 23

• 46

• 1

• 2

If a woman is a carrier for a sex linked recessive trait of hemophilia and her husband has hemophilia, which of the following is true? Make a punnett square!

• All sons will have hemophilia

• all daughters will have hemophilia

• 50% of daughters and 50% of sons have hemophilia

• 100% of sons have hemophilia and 100% of daughters are carriers

What kind of trait is colorblindness if females can be carriers without having the disease?

• Regular trait

• Sex-linked trait

What determines gender in humans? 

• the X and Y chromosome

• chromosome 21

• codominance

• epistasis