Q: A population of butterflies has the following genotypes: 120 CRCR, 160 CRCW, and 20 CWCW. What is the frequency of the CR allele in this population? Use the formula $$p = \frac{2N_{CRCR} + N_{CRCW}}{2N_{total}}.$$

$$p = \frac{2 \times 120 + 160}{2 \times 300} = \frac{400}{600} = 0.67$$

Q: A population of 1000 individuals has 360 homozygous dominant (AA), 480 heterozygous (Aa), and 160 homozygous recessive (aa) individuals. What is the frequency of the a allele? Use $$q = \frac{2N_{aa} + N_{Aa}}{2N_{total}}.$$

$$q = \frac{2 \times 160 + 480}{2 \times 1000} = \frac{800}{2000} = 0.4$$

Question 1

Which of the following best describes microevolution?

Accepted Answer

A change in allele frequencies in a population over generations.

Question 2

A population of butterflies has the following genotypes: 120 CRCR, 160 CRCW, and 20 CWCW. What is the frequency of the CR allele in this population? Use the formula $$p = \frac{2N_{CRCR} + N_{CRCW}}{2N_{total}}.$$

Accepted Answer

$$p = \frac{2 	imes 120 + 160}{2 	imes 300} = \frac{400}{600} = 0.67$$

Question 3

Which of the following is NOT a condition required for Hardy-Weinberg equilibrium?

Accepted Answer

Small population size

Question 4

A population of 1000 individuals has 360 homozygous dominant (AA), 480 heterozygous (Aa), and 160 homozygous recessive (aa) individuals. What is the frequency of the a allele? Use $$q = \frac{2N_{aa} + N_{Aa}}{2N_{total}}.$$

Accepted Answer

$$q = \frac{2 	imes 160 + 480}{2 	imes 1000} = \frac{800}{2000} = 0.4$$

Question 5

Which type of natural selection favors individuals at both extremes of the phenotypic range?

Accepted Answer

Disruptive selection

Question 6

A sudden reduction in population size due to a natural disaster, resulting in a gene pool different from the original population, is known as:

Accepted Answer

Bottleneck effect

Question 7

Which of the following best describes gene flow?

Accepted Answer

The transfer of alleles into or out of a population due to the movement of individuals or gametes.

Question 8

Which reproductive barrier is characterized by the inability of gametes to fuse, even if mating occurs?

Accepted Answer

Postzygotic barrier

Question 9

Which mechanism of speciation involves geographic separation of populations?

Accepted Answer

Allopatric speciation

Question 10

Which of the following is an example of analogy rather than homology?

Accepted Answer

Wings of bats and wings of insects

Question 11

Which principle is used to construct a phylogenetic tree that requires the fewest evolutionary events?

Accepted Answer

Maximum parsimony

Question 12

Which of the following best describes a mycorrhiza?

Accepted Answer

A mutually beneficial relationship between fungi and plant roots

Question 13

Which major fungal group includes bread molds and molds that form zygosporangia during sexual reproduction?

Accepted Answer

Zygomycetes

Question 14

Which of the following is a key ecological role of fungi?

Accepted Answer

Decomposing organic material and recycling nutrients

Question 15

A scientist is studying a fungus that infects human skin, causing athlete's foot. Which genus is most likely responsible?

Accepted Answer

Trichophyton

Question 16

Which of the following best describes the Hardy-Weinberg principle?

Accepted Answer

It predicts allele and genotype frequencies in a population that is not evolving.

Question 17

Which of the following is an example of a postzygotic reproductive barrier?

Accepted Answer

Hybrid offspring of two species are sterile.

Question 18

Which of the following best describes the founder effect?

Accepted Answer

A small group of individuals colonizes a new area, leading to a gene pool different from the original population.

Question 19

Which of the following is a correct statement about the biological species concept?

Accepted Answer

A species is a group of populations that can interbreed and produce fertile offspring.

Question 20

Which of the following is a real-world application of fungi in genetic research?

Accepted Answer

Yeast Saccharomyces cerevisiae has been genetically modified to produce human glycoproteins, such as insulin-like growth factor.

Population Genetics, Speciation, Phylogeny, and Fungi: General Biology Study Notes

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