Question 1

Which of the following best describes the main difference between mitosis and meiosis in terms of chromosome number in the resulting cells?

Accepted Answer

Mitosis produces cells with the same chromosome number as the parent cell, while meiosis produces cells with half the chromosome number.

Question 2

During which phase of meiosis do homologous chromosomes pair up and exchange genetic material through crossing over?

Accepted Answer

Prophase I

Question 3

A researcher measures the DNA content of yeast cells at different stages of meiosis. If the initial DNA content is $$C$$, what is the expected DNA content of a cell immediately after meiosis II?

Accepted Answer

$$\frac{C}{2}$$

Question 4

Which of the following events is unique to meiosis and does NOT occur during mitosis?

Accepted Answer

Pairing of homologous chromosomes and crossing over

Question 5

If a diploid organism has a chromosome number of $$2n = 8$$, how many chromosomes will each gamete have after meiosis?

Accepted Answer

$$4$$

Question 6

Which structure is responsible for holding homologous chromosomes together during crossing over in prophase I?

Accepted Answer

Chiasma

Question 7

A mutation disrupts the formation of cohesin proteins during meiosis. What is the most likely consequence?

Accepted Answer

Homologous chromosomes will fail to pair and crossing over will not occur.

Question 8

Which phase of meiosis is characterized by the separation of homologous chromosomes?

Accepted Answer

Anaphase I

Question 9

In an experiment, yeast cells are transferred from a nutrient-rich medium to a nutrient-poor medium. Researchers observe a decrease in DNA content per cell over time. Which process is most likely responsible for this observation?

Accepted Answer

Meiosis

Question 10

Which of the following best explains the genetic diversity produced by meiosis?

Accepted Answer

Random alignment of chromosomes during metaphase I and crossing over during prophase I

Question 11

If a cell starts meiosis with $$n = 6$$ chromosomes, how many chromatids will be present in the cell at the end of prophase I?

Accepted Answer

$$12$$

Question 12

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

Accepted Answer

Formation of chiasmata between homologous chromosomes

Question 13

During which stage of meiosis do sister chromatids separate?

Accepted Answer

Anaphase II

Question 14

A cell undergoes meiosis and produces four gametes. If nondisjunction occurs during anaphase I, what is the most likely outcome?

Accepted Answer

Two gametes will have an extra chromosome and two will have one less chromosome.

Question 15

Which of the following best describes the role of synapsis during meiosis?

Accepted Answer

It allows homologous chromosomes to pair and exchange genetic material.

Question 16

In a diploid cell, chromosome duplication occurs before meiosis begins. What is the chromosome composition of the cell immediately after duplication but before meiosis I?

Accepted Answer

Each chromosome consists of two sister chromatids.

Question 17

Which of the following mechanisms ensures that each gamete receives a random assortment of maternal and paternal chromosomes?

Accepted Answer

Independent assortment during metaphase I

Question 18

A scientist observes that the DNA content of a cell doubles before meiosis begins. Which equation best represents the change in DNA content from G1 to G2 phase?

Accepted Answer

$$C_{G2} = 2 	imes C_{G1}$$

Question 19

Which of the following is most likely to increase genetic variation in a population?

Accepted Answer

Crossing over and independent assortment during meiosis

Question 20

What is the primary function of the chiasmata during meiosis?

Accepted Answer

To hold homologous chromosomes together during the first meiotic division

Meiosis: Mechanisms, Chromosome Behavior, and Genetic Variation

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