Genetics Quiz

In humans, freckles (F) on the skin are dominant to no freckles (f). If one parent is homozygous dominant and the other is homozygous recessive for the trait, which statement below best describes their chances of having a child with freckles?

• The parents will have a 50% chance of having a child with freckles.

• Every child they have will have freckles.

• There is a one in four chance of having a child without freckles.

• It is impossible for them to have a child with freckles.

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

In the dihybrid cross for pea plants shown below, R is dominant for round peas, r is recessive for wrinkled peas, Y is dominant for yellow peas, and y is recessive for green peas. A student could accurately make which statements about the offspring of this cross?

• There is a 50% chance of having round, yellow peas.

• There is no chance of having any round, yellow peas.

• There is a 100% chance of having round, green peas.

• There is no chance of having any wrinkled, green peas.

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NGSS.HS-LS3-2

In humans, the allele for being able to roll the tongue is dominant (T) and the allele for not being able to roll the tongue is recessive (t). Which cross will result in all offspring displaying the dominant trait?

• Tt x tt

• Tt x Tt

• TT x tt

• tt x tt

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Blood type is controlled by the inheritance of any two of the following alleles: I^A, I^B, or i. I^A codes for type A blood. I^B codes for Type B blood. Both I^A and I^B are codominant. The i allele is recessive and will cause Type O blood whenever two copies of the allele are present. If a mother has Type AB blood (I^AI^B) and a father has Type O blood (ii), what percentage of their children are likely to have Type A blood?

• 0%

• 25%

• 50%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

A variety of corn can produce yellow or white seeds. Yellow is dominant. White is recessive. If an ear of corn contains only white corn, it must be —

• homozygous recessive

• heterozygous recessive

• heterozygous dominant

• homozygous dominant

In a population of bees, long wings are dominant over short wings. Bees with long wings are –

• heterozygous only

• homozygous dominant only

• heterozygous or homozygous recessive

• heterozygous or homozygous dominant

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NGSS.HS-LS4-3

The Punnett square shows a cross between a homozygous dominant genotype for flower color in pea plants and a heterozygous genotype. Which conclusion can be drawn from the Punnett square above?

• The parents will have four offspring.

• Two of the offspring will be homozygous recessive.

• Only two of the offspring will have the same flower color.

• All of the offspring will have the same flower color.

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NGSS.HS-LS3-1

Curly hair and the ability to taste the chemical PTC are inherited traits. Curly hair (H) is always dominant to straight hair (h). The ability to taste PTC (P) is always dominant to not being able to taste PTC (p). The alleles for straight hair and non-taster for PTC are recessive. If both parents are heterozygous for both traits, what would be the genotype of an offspring with straight hair and the ability to taste PTC?

• HhPp

• hhPp

• Hhpp

• hhpp

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Cystic fibrosis is an autosomal recessive disorder in humans. What is the probability that an offspring will have cystic fibrosis if both parents are carriers of cystic fibrosis?

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Achondroplasia is an inherited condition that affects the formation of bone in humans. The allele for achondroplasia (A) is dominant to the unaffected allele (a). If a person who is homozygous dominant has children with a person who is homozygous recessive, what percentage of their children will likely have achondroplasia? Enter your answer in the box. Your answer must be a whole number.

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NGSS.HS-LS3-1

NGSS.HS-LS3-2