Question

shaping evolutionary theory test

1. evolution occurs at the level of the:

a. individual
b. population
c. cell
d. organ

1. genes are considered the ____ of evolution.

a. result
b. problem
c. raw material
d. environment

1. which principle explains when evolution does not occur?

a. natural selection
b. genetic drift
c. hardy - weinberg principle
d. mutation

1. a population is in genetic equilibrium when:

a. new traits appear
b. allele frequencies change
c. allele frequencies stay the same
d. individuals migrate

1. which equation represents the hardy - weinberg principle?

a. $p + q = 1$
b. $p^2 + 2pq + q^2 = 1$
c. $a + t = c + g$
d. $p × q = 1$

Explanation:

1. Evolution is defined as changes in allele frequencies in a group of organisms over generations, which happens at the population level, not individuals, cells, or organs.
2. Genetic variation (from genes) provides the raw material upon which evolutionary forces act to drive evolution.
3. The Hardy-Weinberg principle outlines the conditions under which allele and genotype frequencies remain constant, meaning no evolution occurs.
4. Genetic equilibrium, as defined by the Hardy-Weinberg principle, requires that allele frequencies in a population do not change across generations.
5. The full Hardy-Weinberg equation for genotype frequencies is $p^2 + 2pq + q^2 = 1$, where $p^2$ is the frequency of homozygous dominant individuals, $2pq$ is heterozygous, and $q^2$ is homozygous recessive. The equation $p + q = 1$ represents allele frequency balance but is the simpler precursor, while the full genotype equation is the core principle representation.

Answer:

1. B. Population
2. C. Raw material
3. C. Hardy-Weinberg principle
4. C. Allele frequencies stay the same
5. B. $p^2 + 2pq + q^2 = 1$