Genetics Quiz

What is the main difference between codominance and incomplete dominance?

• In codominance, both alleles are expressed equally, while in incomplete dominance, the phenotype is a blend of both alleles.

• In codominance, one allele is dominant over the other, while in incomplete dominance, both alleles are recessive.

• In codominance, the phenotype is a blend of both alleles, while in incomplete dominance, one allele is completely expressed over the other.

• There is no difference; both terms describe the same genetic phenomenon.

Which of the following is an example of codominance?

• A red flower crossed with a white flower produces pink flowers.

• A person with AB blood type.

• A white chicken crossed with a black chicken produces grey chickens.

• Tall plants dominating short plants in a cross.

In a Punnett square for a cross involving incomplete dominance, if R represents red flowers and r represents white flowers, what would be the genotype of pink flowers?

• RR

• Rr

• rr

• Rr or rr

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What is the expected phenotype ratio in the offspring when two pink flowers (Rr) are crossed in a scenario of incomplete dominance?

• 1 red : 2 pink : 1 white

• 3 red : 1 white

• All pink

• 2 red : 2 white

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NGSS.HS-LS3-3

In a codominance scenario, if a black cow (BB) is crossed with a white cow (WW), and the alleles B and W are codominant, what would be the phenotype of the offspring?

• All black

• All white

• Black and white spotted

• Grey

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NGSS.HS-LS3-1

What would be the genotype of a black and white spotted cow in a codominance scenario?

• BB

• WW

• BW

• None of the above

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

If a pink flower (Rr) is crossed with a white flower (rr) in incomplete dominance, what is the probability of obtaining a pink flower?

• 25%

• 50%

• 75%

• 100%

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NGSS.HS-LS3-3

Which of the following statements is true about a Punnett square?

• It is used to predict the outcome of genetic crosses.

• It is used to determine the chemical composition of genes.

• It is a tool for measuring physical traits in offspring.

• It is used to change the genetic makeup of an organism.

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NGSS.HS-LS3-1

In a codominance example, if a black and white spotted cow (BW) is crossed with a white cow (WW), what is the probability of getting a white cow?

• 25%

• 50%

• 75%

• 100%

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NGSS.HS-LS3-3

What does a Punnett square show in a genetic cross?

• The physical characteristics of the parents.

• The possible genetic combinations of the offspring.

• The actual outcomes in the offspring.

• The environmental effects on genetic traits.

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