Q: Which equation correctly represents the calculation of genetic distance in a linkage map?

$$d = \frac{\text{Number of recombinant offspring}}{\text{Total number of offspring}} \times 100 (in $$centimorgans)

Question 1

Which of the following best describes the main difference between a genomic DNA library and a cDNA library?

Accepted Answer

A genomic DNA library contains DNA fragments representing the entire genome, while a cDNA library contains only cDNA copies of mRNA representing expressed genes.

Question 2

In Sanger sequencing, what is the role of dideoxynucleotides (ddNTPs)?

Accepted Answer

They terminate DNA synthesis by lacking a 3'-OH group, preventing the addition of further nucleotides.

Question 3

Which sequencing technology is most suitable for sequencing long DNA fragments (over 10,000 base pairs) in real time?

Accepted Answer

Nanopore sequencing

Question 4

A researcher wants to compare gene expression profiles between healthy and cancerous tissues. Which 'omics' approach and sequencing technology should they use?

Accepted Answer

Transcriptomics with RNA-seq using Illumina NGS

Question 5

Which of the following is a key advantage of Next Generation Sequencing (NGS) over Sanger sequencing?

Accepted Answer

NGS allows massively parallel sequencing of millions of short DNA fragments, increasing throughput and reducing cost per base.

Question 6

Which of the following best describes the process of genome assembly?

Accepted Answer

Aligning short sequence reads based on overlapping regions to reconstruct the original genome sequence.

Question 7

Which of the following statements about the Human Genome Project (HGP) is correct?

Accepted Answer

The HGP used BACs and YACs for cloning DNA fragments before sequencing.

Question 8

Which equation correctly represents the calculation of genetic distance in a linkage map?

Accepted Answer

$$d = \frac{	ext{Number of recombinant offspring}}{	ext{Total number of offspring}} 	imes 100 (in $$centimorgans)

Question 9

Which of the following is NOT a typical application of metagenomics?

Accepted Answer

Comparing gene expression profiles between healthy and diseased tissues.

Question 10

A patient is suspected to have a genetic disorder caused by a single nucleotide change. Which type of genetic variation is most likely responsible?

Accepted Answer

Single-nucleotide polymorphism (SNP)

Question 11

Which of the following best describes the main goal of functional genomics?

Accepted Answer

To assign biological functions to genomic elements such as genes and regulatory regions.

Question 12

Which sequencing method would be most appropriate for detecting rare cell types within a complex tissue sample?

Accepted Answer

Single-cell RNA-seq

Question 13

Which of the following is a key feature of third-generation sequencing technologies such as PacBio and Nanopore?

Accepted Answer

They produce long reads and can sequence single DNA molecules in real time.

Question 14

Which of the following omics technologies would be most useful for studying the effects of environmental factors on gene expression without altering the DNA sequence?

Accepted Answer

Epigenomics

Question 15

A scientist is interested in identifying all proteins expressed in a cancer cell line. Which workflow would be most appropriate?

Accepted Answer

Extract proteins, digest with trypsin, separate peptides by liquid chromatography, analyze by mass spectrometry, and map peptides to proteins.

Question 16

Which of the following best explains why the human reference genome is not a consensus genome from a single individual?

Accepted Answer

It was assembled from pooled haploid genomes of multiple individuals to capture genetic diversity.

Question 17

Which of the following is a correct statement about the ENCODE project?

Accepted Answer

It aims to build a comprehensive catalog of functional elements in the human genome, including genes, regulatory elements, and non-coding RNAs.

Question 18

Which of the following best describes the principle of massively parallel sequencing in NGS?

Accepted Answer

Sequencing many DNA fragments simultaneously in a single reaction, generating millions of short reads.

Question 19

Which of the following is a real-world application of genome-wide association studies (GWAS)?

Accepted Answer

Identifying genetic variants associated with increased risk for diseases such as diabetes or cancer.

Recombinant DNA Technology, DNA Sequencing, and Genomic Analysis

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