AP Biology Unit 5 Heredity

What is a dihybrid cross?

• A genetic mix between two individuals that are both heterozygous for two traits.

• A genetic mix between two individuals that are both homozygous for one trait.

• A genetic mix between two individuals that are both heterozygous for one trait.

• A genetic mix between two individuals that are completely unrelated.

What is the phenotypic ratio in a monohybrid cross of complete dominance?

• 1:2

• 2:1

• 3:1

• 4:0

What is complete dominance in genetics?

• Complete dominance occurs when the phenotype of the heterozygote is indistinguishable from that of the dominant homozygote.

• Complete dominance occurs when both alleles are expressed equally in the phenotype.

• Complete dominance occurs when the recessive allele completely masks the effect of the dominant allele.

• Complete dominance occurs when the phenotype of the homozygote is different from that of the heterozygote.

In a dihybrid cross of complete dominance, what is the phenotypic ratio?

• 3:1

• 9:3:3:1

• 1:2:1

• 1:1:1:1

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What is incomplete dominance?

• A genetic situation where one allele completely dominates another allele, resulting in a single phenotype.

• A genetic situation in which one allele does not completely dominate another allele, resulting in a new phenotype.

• A condition where both alleles are expressed equally, leading to a blended phenotype.

• A genetic phenomenon where alleles are inherited independently of each other.

What is the difference between homozygous and heterozygous genotypes?

• Homozygous genotypes have two identical alleles for a trait, while heterozygous genotypes have two different alleles for a trait.

• Homozygous genotypes have two different alleles for a trait, while heterozygous genotypes have two identical alleles for a trait.

• Homozygous genotypes have one dominant and one recessive allele, while heterozygous genotypes have two dominant alleles.

• Homozygous genotypes are always recessive, while heterozygous genotypes are always dominant.

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What is the role of alleles in inheritance?

• Alleles are identical copies of a gene that do not affect traits.

• Alleles are different versions of a gene that determine specific traits in an organism, and they can be dominant or recessive.

• Alleles are proteins that help in the formation of traits.

• Alleles are environmental factors that influence genetic traits.

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What is the probability of obtaining a red, axial offspring from a cross between a white, terminal flower and a red, axial flower?

• 1/4

• 3/8

• 9/16

• 1/2

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What is the expected phenotypic ratio for a dihybrid cross?

• 3:1

• 9:3:3:1

• 1:2:1

• 1:1:1:1

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NGSS.HS-LS3-3

What does the term 'genotype' refer to in genetics?

• The physical appearance of an individual

• The genetic constitution of an individual, specifically the alleles present at a given locus

• The environmental factors affecting an organism

• The process of cell division in organisms

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