Question 1

Which enzyme is primarily responsible for unwinding the DNA double helix during DNA replication?

Accepted Answer

Helicase

Question 2

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

Accepted Answer

Increased frequency of mutations in the newly synthesized DNA

Question 3

Which of the following best describes the difference between a gene and a genome?

Accepted Answer

A gene is a segment of DNA that codes for a protein, while a genome is the complete set of genetic material in an organism.

Question 4

During meiosis, nondisjunction can lead to aneuploidy. Which of the following best explains this phenomenon?

Accepted Answer

Homologous chromosomes fail to separate during meiosis I, resulting in gametes with abnormal chromosome numbers.

Question 5

Which of the following is NOT a function of tRNA during translation?

Accepted Answer

Catalyzing peptide bond formation between amino acids

Question 6

A patient is diagnosed with sickle cell anemia, which is caused by a single nucleotide substitution in the beta-globin gene. What type of mutation is this?

Accepted Answer

Missense mutation

Question 7

Which equation correctly represents the Hardy-Weinberg equilibrium for a population with two alleles, $$p$$ and $$q$$?

Accepted Answer

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

Question 8

Which process increases genetic variation during meiosis?

Accepted Answer

Crossing over between homologous chromosomes

Question 9

A woman who is a carrier for cystic fibrosis (autosomal recessive) and a man who is not a carrier have a child. What is the probability that the child will have cystic fibrosis?

Accepted Answer

$$0$$

Question 10

Which of the following statements about DNA replication is correct?

Accepted Answer

DNA replication is semiconservative, with each new double helix containing one old and one new strand.

Question 11

Which of the following best explains why Mendel's Law of Independent Assortment does not always apply to genes located close together on the same chromosome?

Accepted Answer

Linked genes tend to be inherited together because they are physically close and less likely to be separated by crossing over.

Question 12

Which of the following is a real-world example of incomplete dominance?

Accepted Answer

A cross between red and white snapdragons producing pink offspring

Question 13

Which of the following is the correct sequence of events in gene expression?

Accepted Answer

Transcription → Translation → Protein synthesis

Question 14

A pedigree chart shows a trait that appears in every generation and affects both males and females equally. What is the most likely mode of inheritance?

Accepted Answer

Autosomal dominant

Question 15

Which of the following best describes the role of mRNA in protein synthesis?

Accepted Answer

It carries the genetic code from DNA to the ribosome for translation.

Question 16

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

Accepted Answer

Alteration of the reading frame, potentially resulting in a completely different and nonfunctional protein

Question 17

Which phase of meiosis is responsible for the separation of homologous chromosomes?

Accepted Answer

Anaphase I

Question 18

A man with blood type AB marries a woman with blood type O. What are the possible blood types of their children?

Accepted Answer

A or B

Question 19

Which of the following is true about the difference between mitosis and meiosis?

Accepted Answer

Mitosis produces two genetically identical diploid cells, while meiosis produces four genetically unique haploid cells.

Question 20

Which of the following best explains the concept of codominance?

Accepted Answer

Both alleles are fully expressed in the phenotype of the heterozygote.

Genetics, DNA, and Chromosomal Inheritance: Study Guide for Lecture Test 3

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