Genetics review quiz

What is the difference between meiosis and mitosis?

• Mitosis makes sex cells

• Meiosis makes sex cells

• Mitosis give you cells with 1/2 the number of chromosomes

• Meiosis gives you cells with 1/2 the number of chromosomes

What is the difference between genotype and phenotype?

• Genotype describes what you look like.

• Phenotype describes what you look like.

• Genotype describes what alleles you have.

• Phenotype describes what alleles you have.

What is the heterozygous phenotype?

• Red

• Blue

• AA

• aa

• Aa

What is the homozygous recessive genotype?

• red

• blue

• AA

• aa

• Aa

Freckles are dominant (F) over no freckles (f). If both parents are heterozygous. What is the probability that their children will be heterozygous?

• 0%

• 25%

• 50%

• 75%

• 100%

Freckles are dominant (F) over no freckles (f). If both parents are heterozygous. What is the probability that their children will have no freckles?

• 0%

• 25%

• 50%

• 75%

• 100%

What is the difference between blood type A and B?

• type A has A antibodies

• type B has A antibodies

• type A has A antigens (receptors)

• type B has A antigens (receptors)

Why is type O blood considered a universal donor?

• Because they don't have any antibodies

• Because they don't have any antigens (receptors)

• Because they have all the antibodies

• Because they have all the antigens (receptors)

Women have sex chromosomes of XX and men have sex chromosomes XY. Which of a woman's grandparents could not be the source of any of the genes on either of her X chromosomes?

• Mother's father

• Mother's mother

• Father's father

• Father's mother

Hemophilia is an X-linked recessive condition in which blood does not clot properly. Queen Victoria of England had one allele for hemophilia. Most of her male descendants had the disorder, but few females had it. Why did hemophilia occur more frequently in Queen Victoria’s male descendants?

• Only one copy of the X chromosome is found in cells of males, but two copies are found in cells of females.

• Replication of the X chromosome occurs often in males but rarely in females.

• Males have hormones that enhance the expression of X-linked traits.

• Males mature more slowly than females, allowing recessive traits more time to appear.