Question 1

Which of the following best describes Mendelian inheritance as observed in pea plants by Gregor Mendel?

Accepted Answer

Traits are inherited independently and follow predictable ratios based on dominant and recessive alleles.

Question 2

A geneticist crosses two heterozygous pea plants ($$Rr) $$for round seeds. What is the expected phenotypic ratio in the offspring?

Accepted Answer

$$3:1$$ round to wrinkled

Question 3

Which scenario best illustrates non-Mendelian inheritance?

Accepted Answer

A trait influenced by multiple genes and environmental factors, such as skin color.

Question 4

If a child inherits cystic fibrosis, an autosomal recessive disorder, what is the genotype of the parents?

Accepted Answer

Both parents must be heterozygous carriers.

Question 5

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

Accepted Answer

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

Question 6

A patient is diagnosed with sickle cell anemia, which is caused by a mutation in the $$\beta-$$globin gene. What type of mutation is responsible for this disease?

Accepted Answer

A missense mutation resulting in a single amino acid substitution.

Question 7

During DNA replication, which enzyme is responsible for synthesizing the new DNA strand by adding nucleotides?

Accepted Answer

DNA polymerase

Question 8

A population of butterflies has two alleles for wing color: $$B ($$black) and $$b ($$white). If the frequency of $$B is$$ $$0.7$$, what is the expected frequency of heterozygotes ($$Bb) $$under Hardy-Weinberg equilibrium?

Accepted Answer

$$0.42$$

Question 9

Which process is most directly responsible for the repair of thymine dimers caused by UV radiation in human cells?

Accepted Answer

Nucleotide excision repair

Question 10

A researcher uses PCR to amplify a segment of DNA. Which of the following is NOT required for the reaction?

Accepted Answer

DNA ligase

Question 11

Which of the following best explains the concept of genetic linkage?

Accepted Answer

Genes located close together on the same chromosome tend to be inherited together.

Question 12

A pedigree 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 13

Which of the following is a real-world application of CRISPR-Cas9 technology?

Accepted Answer

Editing genes to correct mutations causing genetic diseases

Question 14

A population of mice has the following genotype frequencies: $$AA = 0.36$$, $$Aa = 0.48$$, $$aa = 0.16. $$What are the allele frequencies of $$A$$ and $$a$$?

Accepted Answer

$$A = 0.6$$, a = 0.4$

Question 15

Which statement best describes the role of RNA polymerase during transcription?

Accepted Answer

It unwinds the DNA double helix and synthesizes a complementary RNA strand.

Question 16

A patient with Turner syndrome has a karyotype of $$45, X. $$Which chromosomal event most likely led to this condition?

Accepted Answer

Non-disjunction during meiosis resulting in monosomy X.

Question 17

Which of the following best describes quantitative genetics?

Accepted Answer

The study of traits influenced by multiple genes and environmental factors, often measured on a continuous scale.

Question 18

A bacterial cell is exposed to an antibiotic. After several generations, some cells survive due to a mutation. What genetic process best explains the spread of resistance in the population?

Accepted Answer

Natural selection

Question 19

Which molecular technique is most suitable for comparing gene expression levels between cancerous and normal tissue samples?

Accepted Answer

RNA sequencing

Question 20

A child is born with Down syndrome. Which chromosomal abnormality is responsible for this condition?

Accepted Answer

Trisomy 21

Genetics Course Syllabus and Topic Overview

Study Guide - Practice Questions

Study Guide - Flashcards