Question 1

A researcher wants to identify genes involved in drought resistance in a newly discovered plant species. Which genetic approach would be most appropriate for discovering unknown genes responsible for this trait, and why?

Accepted Answer

Forward genetics, because it starts with a phenotype and identifies the underlying gene.

Question 2

Which of the following best describes the advantage of using two different restriction enzymes instead of one during DNA cloning?

Accepted Answer

It allows for directional cloning, ensuring the insert is oriented correctly.

Question 3

A scientist is working with a multicellular diploid organism and wants to study a gene essential for viability. Which strategy is most appropriate for generating mutations in this gene?

Accepted Answer

Create a conditional allele that is functional under permissive conditions and nonfunctional under restrictive conditions.

Question 4

Which of the following best explains the purpose of the multiple cloning site (MCS) in a plasmid vector?

Accepted Answer

It contains several unique restriction sites to facilitate the insertion of foreign DNA.

Question 5

A researcher uses a suppressor screen to identify mutations that restore function to a mutant phenotype. What can this approach reveal?

Accepted Answer

It can identify genes that act in the same pathway or interact with the mutated gene.

Question 6

Which of the following is a key difference between a genomic DNA library and a cDNA library?

Accepted Answer

A cDNA library contains only coding sequences derived from mRNA, while a genomic library contains all DNA sequences, including introns and regulatory regions.

Question 7

A scientist is using CRISPR-Cas9 to generate a gene knockout in mice. Which component is responsible for guiding the Cas9 nuclease to the specific DNA sequence?

Accepted Answer

Guide RNA (gRNA)

Question 8

Which of the following best describes the function of a selectable marker in a cloning vector?

Accepted Answer

It allows for the identification of cells that have taken up the vector by conferring resistance to an antibiotic.

Question 9

A researcher is interested in identifying protein-protein interactions in yeast. Which technique should they use?

Accepted Answer

Yeast two-hybrid assay

Question 10

Which of the following statements about somatic and germinal gene therapy is correct?

Accepted Answer

Somatic gene therapy affects only the treated individual, while germinal gene therapy can be inherited by offspring.

Question 11

A scientist is comparing the genomes of several bacterial strains to identify genes present in all strains. What is the term for the set of genes shared by all strains?

Accepted Answer

Core genome

Question 12

Which of the following best describes the process of phylogenetic footprinting?

Accepted Answer

Comparing noncoding sequences from multiple related species to identify conserved regulatory elements.

Question 13

A researcher uses a DNA microarray to compare gene expression between cancerous and normal cells. Which of the following is a direct outcome of this experiment?

Accepted Answer

Identification of genes that are upregulated or downregulated in cancer cells.

Question 14

Which of the following is a benefit of using a high-rate mutagenesis method in a forward genetic screen?

Accepted Answer

It increases the probability of generating multiple independent mutations in the same gene.

Question 15

A scientist is using homologous recombination to replace a gene in yeast with a selectable marker. Which of the following best describes the mechanism?

Accepted Answer

The selectable marker is flanked by sequences homologous to the target gene, allowing for precise replacement via recombination.

Question 16

Which of the following best describes a conditional allele?

Accepted Answer

An allele that is functional only under specific environmental conditions, such as temperature.

Question 17

A researcher is using BLAST to compare a newly sequenced gene to known genes in other species. What is the primary purpose of this analysis?

Accepted Answer

To identify homologous genes and infer possible gene function.

Question 18

Which of the following is a key feature of a transcriptional reporter (transcriptional gene fusion)?

Accepted Answer

It fuses the promoter of a gene of interest to a reporter gene, allowing analysis of promoter activity.

Question 19

A scientist is constructing a cDNA library from human brain tissue. Which enzyme is essential for synthesizing cDNA from mRNA templates?

Accepted Answer

Reverse transcriptase

Question 20

A researcher is analyzing a gene family in humans and finds that two genes arose from a duplication event and now have different functions. What is this process called?

Accepted Answer

Neofunctionalization

Genetics Study Guide: Mutagenesis, Gene Editing, Recombinant DNA, and Genomics

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