Genetics Quiz: Concepts and Applications

In a monohybrid cross between two heterozygous tall pea plants (Tt), what is the expected phenotypic ratio of the offspring?

• 1:1

• 3:1

• 1:2:1

• 2:2

Which of the following represents a dihybrid cross between two heterozygous pea plants for seed shape (Rr) and seed color (Yy)?

• Rr x Rr

• RrYy x RrYy

• RRYY x rryy

• Rr x Yy

In co-dominance, if a red-flowered plant (RR) is crossed with a white-flowered plant (WW), what will be the phenotype of the offspring?

• All red

• All white

• Pink

• Red and white patches

Given a pedigree chart where a trait is passed from a father to all his daughters but not to his sons, what type of inheritance pattern is most likely being shown?

• Autosomal dominant

• Autosomal recessive

• X-linked dominant

• Y-linked

If a plant with genotype AaBb is crossed with a plant with genotype aabb, what is the expected phenotypic ratio of the offspring?

• 1:1:1:1

• 9:3:3:1

• 3:1

• 1:2:1

Which of the following best describes the difference between genotype and phenotype?

• Genotype is the physical appearance, phenotype is the genetic makeup.

• Genotype is the genetic makeup, phenotype is the physical appearance.

• Genotype and phenotype are the same.

• Genotype is the environment, phenotype is the genetic makeup.

In a pedigree chart, a shaded circle represents a female with a particular trait. What does an unshaded square represent?

• A male with the trait

• A female without the trait

• A male without the trait

• A female with the trait

If a homozygous red flower (RR) is crossed with a homozygous white flower (rr), and the resulting offspring are all pink, what type of inheritance pattern is this an example of?

• Complete dominance

• Incomplete dominance

• Co-dominance

• Polygenic inheritance

In a dihybrid cross, what is the probability of obtaining an offspring with the genotype RrYy from parents both with genotype RrYy?

Which of the following is an example of a phenotype?

• Bb

• Blue eyes

• BbTt

• Heterozygous