Question 1

Which inheritance pattern is illustrated when the F1 generation of a cross between red and white snapdragons produces pink flowers, as shown in the first image?

Accepted Answer

Incomplete dominance

Question 2

In the second image, the F1 generation of a cross between a red flower (RR) and a white flower (rr) produces flowers with both red and white patches. What is the term for this genetic phenomenon?

Accepted Answer

Codominance

Question 3

A person with genotype $$I^A I^B$$ for the ABO blood group will have which phenotype?

Accepted Answer

Type AB blood

Question 4

Which of the following best describes pleiotropy?

Accepted Answer

A single gene affects multiple phenotypic traits

Question 5

Polydactyly is caused by a dominant allele, but is rare in the population. What does this illustrate about dominant alleles?

Accepted Answer

Dominant alleles are not necessarily more common than recessive alleles

Question 6

Which equation represents the expected phenotypic ratio in the F2 generation for a dihybrid cross with epistatic interaction, as seen in Labrador retrievers?

Accepted Answer

$$9:6:1$$

Question 7

A person with sickle-cell anemia is generally immune to malaria. This is an example of:

Accepted Answer

Pleiotropy

Question 8

Which of the following is an example of polygenic inheritance?

Accepted Answer

Height in humans

Question 9

If a child has type O blood, which of the following parental genotype combinations is possible?

Accepted Answer

Parent 1: $$I^A i$$, Parent 2: $$I^B i$$

Question 10

Which of the following best describes multifactorial traits?

Accepted Answer

Traits determined by both genetic and environmental factors

Question 11

In incomplete dominance, what is the expected phenotypic ratio in the F2 generation from a cross between two F1 hybrids?

Accepted Answer

$$1:2:1$$

Question 12

Which scenario best illustrates epistasis?

Accepted Answer

A gene for pigment deposition masks the expression of pigment color in Labrador retrievers

Question 13

Which of the following is NOT a characteristic of polygenic inheritance?

Accepted Answer

Single gene with two alleles

Question 14

A person with genotype $$I^A i$$ has which blood type?

Accepted Answer

Type A

Question 15

Which of the following best explains why identical twins raised in different environments may have different phenotypes for a multifactorial trait?

Accepted Answer

Environmental factors influence the expression of genetic traits

Question 16

Which inheritance pattern is observed when both alleles in a heterozygote are fully expressed, as in the AB blood group?

Accepted Answer

Codominance

Question 17

Which of the following is an example of a trait determined by multiple alleles?

Accepted Answer

ABO blood group

Question 18

Which of the following best describes the relationship between genotype and phenotype in multifactorial disorders?

Accepted Answer

Phenotype is determined by both genotype and environment

Question 19

Which of the following is a common misconception about dominant alleles?

Accepted Answer

Dominant alleles are always more common in a population

Question 20

Which of the following best describes the effect of pleiotropic genes?

Accepted Answer

They affect multiple phenotypic traits

Complex Patterns of Inheritance: Beyond Mendelian Genetics

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