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 student is conducting a PCR experiment to detect GMOs in a food sample. Which enzyme is essential for the amplification of DNA during PCR?

Accepted Answer

DNA polymerase

Question 3

Which of the following equations correctly represents the Hardy-Weinberg equilibrium for a gene with two alleles, A and a?

Accepted Answer

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

Question 4

Which process is responsible for the separation of homologous chromosomes during meiosis?

Accepted Answer

Anaphase I

Question 5

A mutation in the lac operon of E. coli prevents the repressor protein from binding to the operator. What is the most likely outcome?

Accepted Answer

The structural genes will be continuously transcribed.

Question 6

Which of the following best explains why cancer is considered a genetic disease?

Accepted Answer

Cancer results from mutations in genes that control cell growth and division.

Question 7

During DNA replication, which enzyme is responsible for unwinding the double helix?

Accepted Answer

Helicase

Question 8

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 9

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

Accepted Answer

Editing genes to correct mutations causing genetic diseases

Question 10

Which of the following statements about Mendelian genetics is correct?

Accepted Answer

A monohybrid cross between two heterozygotes (Aa x Aa) results in a 3:1 phenotypic ratio.

Question 11

Which laboratory technique is used to separate DNA fragments based on size?

Accepted Answer

Gel electrophoresis

Question 12

Which of the following best describes gene regulation in eukaryotes compared to prokaryotes?

Accepted Answer

Eukaryotic gene regulation involves multiple levels, including chromatin remodeling and RNA processing.

Question 13

A patient is diagnosed with a genetic disorder caused by a single nucleotide substitution. What type of mutation is this?

Accepted Answer

Point mutation

Question 14

Which of the following is a key feature of population genetics?

Accepted Answer

It studies the distribution and change of allele frequencies under evolutionary processes.

Question 15

Which equation would you use to calculate the frequency of a dominant allele in a population if you know the frequencies of all genotypes?

Accepted Answer

$$p = f(AA) + \frac{1}{2}f(Aa)$$

Question 16

Which of the following scenarios best illustrates incomplete dominance?

Accepted Answer

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

Question 17

Which of the following is a consequence of a frameshift mutation?

Accepted Answer

It alters the reading frame, potentially changing every amino acid downstream.

Question 18

Which of the following best describes the function of tRNA during translation?

Accepted Answer

It brings amino acids to the ribosome and matches them to the mRNA codon.

Question 19

A researcher is using electrophoresis to analyze DNA samples from a cancer gene detection lab. What is the primary factor that determines how far a DNA fragment migrates in the gel?

Accepted Answer

The size (length) of the DNA fragment

Question 20

Which of the following is a real-world example of gene therapy?

Accepted Answer

Introducing a functional copy of a gene into a patient with cystic fibrosis

BI 318 Genetics Syllabus and Course Overview

Study Guide - Practice Questions

Study Guide - Flashcards