Take this Quiz: A-Level Biology: Inheritance, Populations and Evolution | Zestly

Question 1

In a hypothetical plant species, flower color is controlled by a single gene with two alleles: R (red) and r (white). If a heterozygous plant is self-crossed, what is the expected phenotypic ratio of the offspring?

Accepted Answer

3:1

Question 2

Which of the following statements correctly describe the characteristics of the Hardy-Weinberg principle? Select all that apply.

Accepted Answer

The population must be large to minimize the effects of genetic drift.

Question 3

In a population of 500 individuals, 20 are homozygous recessive for a specific trait. Assuming the population is in Hardy-Weinberg equilibrium, what is the frequency of the recessive allele ($q$)?

Accepted Answer

0.2

Question 4

Which of the following scenarios best exemplify the founder effect? Select all that apply.

Answer

A small group of birds colonizes a remote island, carrying only a fraction of the original population's genetic diversity.

Answer

A massive volcanic eruption kills 90% of a population, leaving a random subset of survivors.

Answer

A population experiences a steady increase in fitness due to directional selection.

Answer

A few individuals from a mainland population migrate to a new habitat, establishing a new colony with distinct allele frequencies.

Question 5

In a dihybrid cross between two plants heterozygous for both seed shape (RrYy) and seed color (RrYy), where R is round, r is wrinkled, Y is yellow, and y is green, what is the expected phenotypic ratio of the offspring?

Answer

1:1:1:1

Answer

3:1:3:1

Answer

9:3:3:1

Answer

1:2:1:2:4:2:1:2:1