Question 1

Which of the following best describes a chromosomal rearrangement that can occur during meiosis due to incorrect pairing of homologous chromosomes?

Accepted Answer

Crossing over of misaligned nonsister chromatids

Question 2

A DNA polymerase slips during replication, resulting in a small duplication. Which type of genetic change is most likely to occur?

Accepted Answer

Short tandem repeat expansion

Question 3

Gene families, such as the $$\alpha-$$globin gene family, are collections of genes that:

Accepted Answer

Share a common evolutionary origin and have similar sequences

Question 4

Which process can result in the creation of a new gene function by mixing and matching exons within a gene?

Accepted Answer

Exon shuffling

Question 5

A scientist discovers a chromosome with both telomere-like and centromere-like sequences in the middle. What is the most likely explanation for this structure?

Accepted Answer

It is the result of a chromosome fusion event

Question 6

Which of the following is a real-world application of ancient DNA sequencing?

Accepted Answer

Identifying the cause of historical pandemics such as the Black Death

Question 7

If a gene duplication occurs followed by a mutation in one copy, what is the most likely evolutionary outcome?

Accepted Answer

One copy may acquire a new function

Question 8

Which equation best represents the probability $$P of a $$crossover event occurring between two loci separated by a genetic distance $$d (in $$centimorgans)?

Accepted Answer

$$P = \frac{d}{100}$$

Question 9

A forensic investigation uses short tandem repeats (STRs) to match DNA samples. Which property of STRs makes them useful for this purpose?

Accepted Answer

STRs vary greatly in repeat number among individuals

Question 10

Which of the following scenarios best illustrates the concept of 'de-extinction' using genomics?

Accepted Answer

Genetically modifying Asian elephants to express woolly mammoth genes

Question 11

Which of the following is a potential environmental benefit of reintroducing woolly mammoths to the Arctic tundra?

Accepted Answer

Reducing permafrost melt by maintaining steppe landscapes

Question 12

What is the main ethical concern associated with companies like 23andMe selling genetic information?

Accepted Answer

Potential misuse of personal genetic data

Question 13

Which of the following best explains how gene families expand over evolutionary time?

Accepted Answer

Gene duplication followed by mutation and divergence

Question 14

A mutation causes a change in the amino acid sequence of a hemoglobin gene. Which type of mutation is this?

Accepted Answer

Nonsynonymous mutation

Question 15

Which of the following is a direct result of crossing over during meiosis?

Accepted Answer

Increased genetic diversity in gametes

Question 16

If a population of ancient humans had a mutation rate of $$2 	imes 10$$^{-8}$$ mutations per base per generation, how many new mutations would you expect in a genome of 3$$ 	imes $$10^9$$ bases per generation?

Accepted Answer

$$2 	imes 10$$^{-8}$$ 	imes 3 	imes 10^9$ = 60$$

Question 17

Which of the following is NOT a mechanism by which new gene functions can arise?

Accepted Answer

Chromosome fusion

Question 18

Why is the study of ancient DNA important for understanding human evolution?

Accepted Answer

It allows direct comparison of genetic changes over time

Question 19

Which of the following best describes the role of artificial wombs in the context of de-extinction projects?

Accepted Answer

They provide a controlled environment for developing hybrid embryos

Question 20

A company uses computational biology software to analyze the genome of an extinct species. Which step is most critical for ensuring accurate results?

Accepted Answer

Quality control of DNA sequence data

Fundamentals of Biology: Molecular and Cell Biology – Lecture 1 Study Notes

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