Genetics Review Quiz

Which three of the following describes Mendel's three laws of genetics?

• A dominant allele will mask a recessive allele.

• Different traits are always inherited together.

• Traits from parents are not passed to offspring.

• Each trait is inherited independently of other traits.

• Alleles for a trait separate during meiosis so that only one allele is found in each gamete.

What are alternate forms of the same gene?

• gametes

• alleles

• homologues

• centromeres

A homozygous dominant individual (BB) will always have what type of offspring?

• offspring that will always show the dominant trait

• offspring that will exhibit the dominant trait only if the other parent is also dominant

• offspring that will always exhibit the recessive trait

• offspring that will exhibit the recessive trait if the other parent has a recessive allele

Brown fur is dominant to white fur and pink eyes are dominant to black eyes. In a dihybrid cross of two parents that are heterozygous for both traits(Bb x Pp), which of the following represents the probability of phenotypes in their offspring?

• 9/16 - Brown fur with pink eyes

  3/16 - Brown fur with black eyes

  3/16 - White fur with pink eyes

  1/16 - White fur with black eyes

• 4/16 - Brown fur with pink eyes

  12/16 - White fur with black eyes

• 4/16 - Brown fur with pink eyes

  4/16 - Brown fur with black eyes

  4/16 - White fur with pink eyes

  4/16 - White fur with black eyes

• 8/16 - Brown fur with pink eyes

  8/16 - White fur with black eyes

Purple flowers are dominant to white flowers. Two plants that are heterozygous for flower color are crossed. What are the probable flower colors of the offspring?

• 25% purple; 75% white

• 75% purple; 25% white

• 50% purple; 50% white

• 25% purple; 25% white; 25% purple/white spotted

What is true of a normal human male?

• He has only one sex chromosome.

• He has two X chromosomes.

• He has two Y chromosome.

• He has one X chromosome and one Y chromosome.

A red flowering plant is crossed with a white flowering plant, and only pink flowering plant are produced? Which of the following explains this pattern of inheritance?

• multiple alleles

• linked genes

• incomplete dominance

• codominance

A mother with type A blood has a son with type B blood. Which of the following are possible. (select 3)

• the mother is homozygous for blood type

• the mother is heterozygous for blood type

• the father is homozygous for blood type

• the father is heterozygous for blood type

• The father has type A blood

Why is color blindness more common in males than in females?

• The allele for color blindness is recessive and located on the X chromosome.

• Color blind males have two copies of the allele for color blindness.

• The allele for color blindness is located on the Y chromosome.

• Fathers pass the allele for color blindness to their sons only.

Huntington's disease is an autosomal dominant disorder. If a female that is normal marries a man that has the disorder, what is the probability they will have a child with the disorder? (The man's mother died from Huntington's disease but his father does not have the disorder)

• 0%

• 50%

• 75%

• 100%