X-Linked Traits and Pedigrees

I have 2 X chromosomes. What am I?

• Male
• Female

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

• Male
• Female

Is this trait (the shaded individuals) dominant or recessive?

• dominant
• recessive

Is this trait (the shaded individuals) dominant or recessive?

• dominant
• recessive

Tags

NGSS.HS-LS3-1

What is the genotype for the third person in generation III

• AA

• Aa

• aa

What percent of the female offspring will be a carrier for this sex-linked recessive disease (a)?

• 0% of the girls will be a carrier

• 50% of the girls will be a carrier

• 100% of the girls will be a carrier

• 25% of the girls will be a carrier

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 punnet square! (STEP 1 - genotypes of parents? STEP 2 - punnet 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

The inheritance of short legs in flies is sex-linked recessive trait. If a short-legged female mates with a long-legged male, what will the offspring be? (STEP 1 - genotypes of parents? STEP 2 - punnet square!)

• all offspring will be short-legged

• all females will be long legged, and all males will be short-legged

• all females will be short-legged, all males will be long-legged

• half of the males and females will be short-legged, and half will be long-legged