Genetics--Patterns of Inheritance

Which type of dominance occurs when one allele completely masks the effect of another allele?

• Incomplete dominance

• Codominance

• Complete dominance

• Partial dominance

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DOK Level 1: Recall

In which type of dominance do both alleles contribute equally to the phenotype?

• Complete dominance

• Incomplete dominance

• Codominance

• Partial dominance

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DOK Level 1: Recall

What is the phenotype of a heterozygous individual in incomplete dominance?

• A blend of both alleles

• Only the dominant allele is expressed

• Both alleles are equally expressed

• Only the recessive allele is expressed

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DOK Level 1: Recall

Which of the following is an example of codominance?

• A red flower and a white flower producing pink offspring

• A black chicken and a white chicken producing speckled offspring

• A tall plant and a short plant producing medium height offspring

• A blue-eyed parent and a brown-eyed parent producing a brown-eyed child

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DOK Level 2: Skill/Concept

In a cross between a red-flowered plant (RR) and a white-flowered plant (WW) showing incomplete dominance, what would be the phenotype of the offspring?

• Red flowers

• White flowers

• Pink flowers

• Red and white flowers

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DOK Level 2: Skill/Concept

FACT: Human blood type is a codominance pattern of inheritance.

If a person has one allele for type A blood and one allele for type B blood, what is their blood type?

• Type A

• Type B

• Type AB

• Type O

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DOK Level 1: Recall

Which of the following scenarios best illustrates complete dominance?

• A red flower and a white flower producing pink offspring

• A black chicken and a white chicken producing speckled offspring

• A tall plant and a short plant producing tall offspring

• A blue-eyed parent and a brown-eyed parent producing a child with green eyes

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DOK Level 2: Skill/Concept

In a genetic cross showing incomplete dominance, what would be the expected phenotype ratio of the offspring if both parents are heterozygous? DO THE PUNNETT SQUARE CROSS FIRST!

• 1:2:1

• 3:1

• 1:1

• 2:1

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DOK Level 2: Skill/Concept

Which type of dominance is illustrated by a flower that has both red and white petals?

• Complete dominance

• Incomplete dominance

• Codominance

• Partial dominance

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DOK Level 1: Recall

Explain why a heterozygous individual with incomplete dominance does not show the dominant trait completely.

• The dominant allele is not strong enough to mask the recessive allele.

• Both alleles are expressed equally.

• The alleles blend to produce a new phenotype.

• The recessive allele is stronger than the dominant allele.

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DOK Level 3: Strategic Thinking