Question 1

Which phase of the cell cycle is primarily responsible for the replication of DNA, and what is the correct order of the phases in the cell cycle?

Accepted Answer

S phase; G1, S, G2, M

Question 2

During meiosis, which event is responsible for the genetic variation observed in gametes, and which law does this illustrate?

Accepted Answer

Independent assortment during metaphase I; Law of Independent Assortment

Question 3

A plant with genotype $$RrYy is $$crossed with another plant of genotype $$rryy. $$What is the expected phenotypic ratio in the offspring if the genes assort independently?

Accepted Answer

$$1:1:1:1$$

Question 4

Which of the following best describes Mendel's Principle of Segregation?

Accepted Answer

Alleles for a trait separate during gamete formation

Question 5

If a genetic disorder is inherited in a recessive manner, which of the following pedigree patterns would you expect to see?

Accepted Answer

Affected individuals often have unaffected parents

Question 6

Which process ensures that each gamete receives only one allele of each gene?

Accepted Answer

Segregation during meiosis I

Question 7

A cell with 8 chromosomes undergoes mitosis. How many chromosomes will each daughter cell have after cytokinesis?

Accepted Answer

8

Question 8

Which of the following scenarios best illustrates the concept of codominance?

Accepted Answer

A person with blood type AB expresses both A and B antigens equally

Question 9

What is the main difference between mitosis and meiosis in terms of their biological purpose?

Accepted Answer

Mitosis produces genetically identical cells for growth and repair; meiosis produces genetically diverse gametes for reproduction

Question 10

Which of the following is NOT a function of checkpoints in the cell cycle?

Accepted Answer

Promoting uncontrolled cell division

Question 11

In a dihybrid cross between two heterozygous individuals ($$AaBb 	imes AaBb$$), what is the expected phenotypic ratio if the genes assort independently?

Accepted Answer

$$9:3:3:1$$

Question 12

Which of the following best explains why crossing over during meiosis increases genetic diversity?

Accepted Answer

It allows homologous chromosomes to exchange genetic material, creating new allele combinations

Question 13

A pedigree shows that a trait appears in both males and females, skips generations, and affected individuals often have unaffected parents. What is the most likely mode of inheritance?

Accepted Answer

Autosomal recessive

Question 14

Which of the following statements about reciprocal crosses is correct?

Accepted Answer

They help determine if a trait is sex-linked by switching the sex of the parent carrying the trait

Question 15

If a cell fails to pass the G1 checkpoint, what is the most likely outcome?

Accepted Answer

The cell will enter a non-dividing state called $$G_0$$

Question 16

Which of the following is an example of particulate inheritance?

Accepted Answer

Traits are inherited as discrete units (genes) that do not blend

Question 17

A woman who is heterozygous for a recessive genetic disorder ($$Aa) $$and a man who is homozygous dominant ($$AA) $$have a child. What is the probability that the child will be a carrier?

Accepted Answer

$$0.5$$

Question 18

Which of the following best describes the outcome of meiosis II?

Accepted Answer

Sister chromatids are separated, resulting in four haploid cells

Question 19

Which of the following is a real-world application of understanding independent assortment?

Accepted Answer

Predicting the inheritance of multiple traits in crop breeding programs

Question 20

A geneticist observes that two genes are inherited together more often than expected by independent assortment. What is the most likely explanation?

Accepted Answer

The genes are linked and located close together on the same chromosome

Study Guide: Cell Cycle, Mitosis, Meiosis, and Mendelian Genetics (Chapters 7-8)

Study Guide - Practice Questions

Study Guide - Flashcards