Unit 5: Heredity

Based on the F₂ phenotypic ratio, the inheritance pattern of seed color in this species is best described as

The genotype of the F₁ offspring is most likely

A chi-square test is performed on the F₂ data using a 3:1 expected ratio. Calculate the chi-square value. Round to two decimal places.

If a yellow-seeded F₂ plant is test-crossed with a green-seeded plant and produces approximately equal numbers of yellow and green offspring, the F₂ plant's genotype is

In humans, if a father has blood type AB and a mother has blood type O, which blood types are possible in their children?

Crossing over during meiosis I increases genetic variation by

In Drosophila, the gene for eye color is X-linked. Red eyes (X^R) are dominant over white eyes (X^r). If a heterozygous red-eyed female is crossed with a white-eyed male, what proportion of the female offspring will have white eyes?

The law of independent assortment states that

A pedigree shows that every affected child has at least one affected parent, and the trait appears in every generation. The most likely inheritance pattern is

Two genes, A and B, are on the same chromosome and are 20 map units apart. In a cross AaBb × aabb, what percentage of offspring would be expected to show a recombinant phenotype?

Based on the pedigree, the most likely mode of inheritance for this trait is

What is the probability that an unaffected son in Generation III is a carrier of the trait?

The Generation II daughter married an unaffected male. For the daughter to have affected children, the unaffected male must be

Non-disjunction during meiosis can result in

Incomplete dominance is best demonstrated when

In a monohybrid cross between two heterozygous parents (Aa × Aa), what fraction of the offspring is expected to be homozygous recessive? Express as a decimal.

In a population in Hardy-Weinberg equilibrium, the frequency of the homozygous recessive genotype (aa) is 0.16. What is the frequency of the dominant allele (p)? Express as a decimal.

Epistasis is demonstrated when

Which of the following would violate the Hardy-Weinberg equilibrium?

Based on the cross between two heterozygous parents (RrYy × RrYy), what is the expected phenotypic ratio in the F₂ generation?