5.66: QUIZIZZ: QUIZ 5.4: NON-MENDELIAN GENETICS: 5D 16W S2 24

1. How many chromosomes are in a normal body cell?

• 46
• 23
• 26
• 54

The image shows two sex chromosomes. Select the letter that is used to describe NUMBER ONE.

• X
• Y
• Z

The image shows two sex chromosomes. Select the letter that is used to describe NUMBER TWO.

• X
• Y
• Z

If a person had the two chromosomes shown in the image, what would be their sex?

• Female
• Male

What are sex-linked traits?

• Genetic traits carried on the X and Y chromosomes that determine biological sex.
• Genetic traits carried on the X chromosome that affect males more than females.
• Genetic traits carried on the Y chromosome that affect females more than males.
• Genetic traits carried on both the X and Y chromosomes that affect males and females equally.

Why are X-linked conditions more common in males?

• Males have two X chromosomes, so they are more likely to be affected by X-linked conditions.
• Females have two X chromosomes, so they are more likely to be carriers of X-linked conditions.
• Males only need to inherit one copy of the mutated gene to be affected by X-linked conditions.
• Females only need to inherit one copy of the mutated gene to be affected by X-linked conditions.

If a female is a carrier of an X-linked condition and has children with a male who does not have the condition, what are the chances of their sons inheriting the condition?

• 25%
• 50%
• 75%
• 100%

What are the sex chromosomes called in humans?

• X and Y
• A and B
• C and D
• M and F

What is the term for when one X chromosome is preferentially inactivated in females?

• Skewed X-inactivation
• Double X-inactivation
• Partial X-inactivation
• Complete X-inactivation

Which of the following is NOT an example of an X-linked condition in humans?

• Hemophilia
• Duchenne muscular dystrophy
• Red-green color blindness
• Sickle cell anemia