Q: A population of butterflies has two alleles for wing color: B (black) and b (white). If the frequency of B is 0.7 and b is 0.3, what is the expected frequency of heterozygotes under Hardy-Weinberg equilibrium?

$$2pq = 2 \times 0.7 \times 0.3 = 0.42$$

Question 1

Which of the following best describes the central dogma of molecular genetics?

Accepted Answer

DNA is transcribed into RNA, which is then translated into protein.

Question 2

A mutation occurs in the gene encoding DNA polymerase, resulting in a loss of proofreading activity. What is the most likely consequence for the cell?

Accepted Answer

An increased rate of mutations during DNA replication.

Question 3

Which equation correctly represents the Hardy-Weinberg equilibrium for allele frequencies in a population?

Accepted Answer

$$p^2 + 2pq$$ + $$q^2 = 1$

Question 4

During a PCR experiment to detect GMOs, which step is responsible for separating the DNA strands?

Accepted Answer

Denaturation

Question 5

A patient is diagnosed with a cancer caused by a mutation in a tumor suppressor gene. Which of the following best explains the role of tumor suppressor genes in cancer?

Accepted Answer

They normally inhibit cell division, and mutations can lead to uncontrolled growth.

Question 6

Which of the following is a real-world application of CRISPR technology?

Accepted Answer

Editing genes to correct mutations causing genetic diseases.

Question 7

If a diploid organism has a genotype AaBb, what are the possible gametes produced by independent assortment?

Accepted Answer

AB, Ab, aB, ab

Question 8

Which process is responsible for the exchange of genetic material between homologous chromosomes during meiosis?

Accepted Answer

Crossing over

Question 9

A population of butterflies has two alleles for wing color: B (black) and b (white). If the frequency of B is 0.7 and b is 0.3, what is the expected frequency of heterozygotes under Hardy-Weinberg equilibrium?

Accepted Answer

$$2pq = 2 	imes 0.7 	imes 0.3 = 0.42$$

Question 10

Which of the following best describes the function of mRNA in gene expression?

Accepted Answer

It carries the genetic code from DNA to the ribosome for protein synthesis.

Question 11

In a laboratory experiment, you use electrophoresis to analyze DNA fragments. What property of DNA allows this technique to separate fragments by size?

Accepted Answer

DNA fragments are negatively charged and move toward the positive electrode, with smaller fragments moving faster.

Question 12

Which of the following scenarios best illustrates incomplete dominance?

Accepted Answer

A cross between red-flowered and white-flowered plants produces pink-flowered offspring.

Question 13

Which equation would you use to calculate the frequency of a recessive phenotype in a population under Hardy-Weinberg equilibrium?

Accepted Answer

$$q^2$$

Question 14

A researcher wants to amplify a specific DNA sequence from a sample. Which technique should they use?

Accepted Answer

Polymerase Chain Reaction (PCR)

Question 15

Which of the following is a key difference between prokaryotic and eukaryotic gene regulation?

Accepted Answer

Eukaryotic gene regulation often involves chromatin remodeling and enhancers, while prokaryotic regulation is typically at the level of transcription initiation.

Question 16

A geneticist observes that a certain trait does not follow Mendel’s law of independent assortment. Which of the following is the most likely explanation?

Accepted Answer

The genes are located close together on the same chromosome (genetic linkage).

Question 17

Which of the following best describes the flow of genetic information in a eukaryotic cell?

Accepted Answer

$$DNA \rightarrow RNA \rightarrow Protein$$

Question 18

A population is not in Hardy-Weinberg equilibrium. Which of the following could be a reason?

Accepted Answer

Non-random mating is occurring.

Question 19

Which of the following is a direct result of a frameshift mutation in a coding sequence?

Accepted Answer

A change in the reading frame, potentially altering every amino acid downstream.

Question 20

Which laboratory technique would you use to separate and visualize DNA fragments after PCR amplification?

Accepted Answer

Gel electrophoresis

BI318 Genetics Syllabus and Course Overview

Study Guide - Practice Questions

Study Guide - Flashcards