Chapter 13 - "Sex-Linked Inheritance"

What is the purpose of using a pedigree?

• To determine the average age of a family 
• To find out family histories and medical records 
• To find out whether a couple can have a boy or a girl 
• To trace the inheritance of a certain trait through generations

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

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%

Looking at this pedigree, how many female family members are carriers?

• 1
• 3
• 10
• 7

Looking at this pedigree, how many family members have the disease?

• 4
• 7
• All
• None