Question 1

Which of the following best describes the main function of the CRISPR-Cas system in bacteria?

Accepted Answer

It is an adaptive immune system that targets and destroys invading viral DNA.

Question 2

During which phase of the cell cycle does DNA replication occur in eukaryotic cells?

Accepted Answer

S phase

Question 3

A diploid organism has a chromosome number of $$2n = 8. $$After meiosis II, how many chromosomes and chromatids will each gamete contain?

Accepted Answer

$$4$$ chromosomes and $$4$$ chromatids$

Question 4

Which of the following statements about Mendel’s law of independent assortment is correct?

Accepted Answer

Genes located on different chromosomes assort independently during gamete formation.

Question 5

In a dihybrid cross between two heterozygous individuals ($$AaBb 	imes AaBb$$), what is the expected phenotypic ratio in the F2 generation, assuming complete dominance and independent assortment?

Accepted Answer

$$9:3:3:1$$

Question 6

Which of the following best explains the molecular basis of sickle-cell anemia?

Accepted Answer

A single nucleotide substitution in the beta-globin gene leading to an amino acid change

Question 7

What is the primary role of the enzyme separase during mitosis?

Accepted Answer

It degrades cohesin to allow sister chromatid separation at anaphase.

Question 8

A testcross is performed between a plant with an unknown genotype showing a dominant phenotype and a homozygous recessive plant. If the unknown plant is heterozygous, what is the expected phenotypic ratio among the offspring?

Accepted Answer

$$1:1 ($$dominant:recessive)$

Question 9

Which of the following is a direct application of recombinant DNA technology in medicine?

Accepted Answer

Synthesis of human insulin in bacteria for diabetes treatment

Question 10

Which of the following best describes the difference between forward genetics and reverse genetics?

Accepted Answer

Forward genetics starts with a phenotype and identifies the gene responsible; reverse genetics starts with a known gene and investigates its function.

Question 11

In the context of eukaryotic gene regulation, what is the main function of alternative splicing?

Accepted Answer

To increase the number of protein isoforms produced from a single gene

Question 12

Which of the following is a key ethical concern associated with the use of CRISPR-Cas9 genome editing in humans?

Accepted Answer

The potential for unintended heritable genetic changes in future generations

Question 13

A plant with genotype $$AaBb is $$self-fertilized. What is the probability that an offspring will have the genotype $$AABB$$?

Accepted Answer

$$\frac{1}{16}$$

Question 14

Which of the following best describes the role of model organisms in genetics research?

Accepted Answer

They allow researchers to study fundamental biological processes that are often conserved in humans.

Question 15

Which of the following statements about the chromosomal theory of inheritance is correct?

Accepted Answer

Genes are located on chromosomes, which are transmitted from parents to offspring.

Question 16

Which of the following is a consequence of independent assortment during meiosis?

Accepted Answer

Each gamete receives a random combination of maternal and paternal chromosomes, increasing genetic diversity.

Question 17

In a population of diploid organisms with $$n = 3 ($$three pairs of chromosomes), how many different combinations of chromosomes can be produced in gametes due to independent assortment alone?

Accepted Answer

$$2^3 = 8$

Question 18

Which of the following best describes the function of the nucleolus in eukaryotic cells?

Accepted Answer

It is the site of ribosomal RNA (rRNA) synthesis and ribosome assembly.

Question 19

Which of the following is a direct result of a single nucleotide change in the DNA sequence of a gene?

Accepted Answer

A change in the amino acid sequence of the encoded protein

Foundations of Genetics: Key Concepts, Chromosomes, and Mendelian Inheritance

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