Punnett Square Quiz

The inheritance of short wings in Drosophila fruit flies is an x-linked, recessive trait. Which would most likely result if a short-winged female mates with a long-winged male?

• All offspring will be short-winged.

• All females will be long-winged, and all males will be short-winged

• All females will be short-winged, and all males will be long-winged.

• Half of the males and females will be short-winged, and half will be long-winged.

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Which set of parents can most likely produce a child with type O blood?

• one parent with type AB blood, and the other parent with type A blood

• one parent with type AB blood, and the other parent with type O blood

• one parent with heterozygous type A blood, and the other parent with type O blood

• one parent with homozygous type A blood, and the other parent with homozygous type B blood

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One of the parents of a child has phenylketonuria (PKU), which is caused by recessive alleles. The other parent does not have the PKU alleles. What is the chance that the couple will have a child with phenylketonuria?

• 0%

• 50%

• 75%

• 100%

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Hitchhiker's thumb (H) is dominant to no hitchhiker's thumb (h). A woman who does not have hitchhiker's thumb marries a man who is heterozygous for hitchhiker's thumb. What is the probable genotype ratio of their children?

• 0% Hh : 100% hh

• 50% Hh : 50% hh

• 75% Hh : 25% hh

• 100% Hh : 0% hh

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Having freckles is dominant over not having freckles. If two individuals heterozygous for freckles have a child, what is the probability the child will have freckles?

• 0%

• 25%

• 50%

• 75%

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Tomato plants usually have hairy stems. Hairless stems are present in tomato plants that are homozygous recessive for this trait. If the stem characteristics are determined by a single gene, what is the expected outcome of crossing two tomato plants that are heterozygous for hairy stems?

• 75% hairy stems: 25% hairless stems

• 100% hairy stems

• 100% hairless stems

• 50% hairy stems: 50% hairless stems

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Normal fruit flies have brownish-yellow bodies, and this body color is dominant. A mutation

in the gene for body color can produce flies with an ebony body color. A homozygous normal fruit fly (e+e+) is crossed with a homozygous ebony fruit fly (ee). What is the predicted outcome of this genetic cross?

• All the offspring will have ebony bodies.

• Of the offspring, 75% will have brownish-yellow bodies, and 25% will have ebony

  bodies.

• All the offspring will have brownish-yellow bodies.

• Of the offspring, 75% will have ebony bodies, and 25% will have brownish-yellow

  bodies.

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Chickens can have different types of feathers. Frizzled feathers curl toward a chicken’s head. Assume that feather type is determined by a single gene and that the allele for frizzled feathers is dominant over the allele for straight feathers. In a cross between two chickens with straight feathers, what percentage of the offspring can be expected to have frizzled feathers?

• 0%

• 25%

• 50%

• 100%

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A breed of chicken shows codominance for feather color. One allele codes for black feathers, another codes for white feathers. The feathers of heterozygous chickens of this breed will be:

• all black

• all white

• all gray

• speckled black and white

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Snap dragon color is a incomplete dominant trait.  A red flower (RR) is crossed with white flower (rr)? What color are flowers that are Rr?

• red

• red and white

• white

• pink

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