Question 1

Which of the following best describes the main outcome of meiosis compared to mitosis?

Accepted Answer

Meiosis produces four genetically distinct haploid cells, while mitosis produces two genetically identical diploid cells.

Question 2

During which phase of meiosis does crossing over occur, and what is its significance?

Accepted Answer

Crossing over occurs during prophase I and increases genetic variation among gametes.

Question 3

If a diploid cell with $$2n = 8$$ undergoes meiosis, how many chromosomes will each daughter cell have at the end of meiosis II?

Accepted Answer

$$4$$

Question 4

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

Accepted Answer

Synapsis and crossing over between homologous chromosomes

Question 5

A human cell with $$n = 23$$ can produce how many different combinations of chromosomes in its gametes due to independent assortment alone?

Accepted Answer

$$2^{23}$$

Question 6

Which mechanism does NOT contribute to genetic variation in sexually reproducing organisms?

Accepted Answer

Replication of DNA during interphase

Question 7

During metaphase I of meiosis, what is the arrangement of chromosomes at the metaphase plate?

Accepted Answer

Homologous pairs of chromosomes line up at the metaphase plate.

Question 8

Why are the four daughter cells produced by meiosis genetically distinct from each other and from the parent cell?

Accepted Answer

Because of crossing over, independent assortment, and random fertilization.

Question 9

Which of the following best explains why sexual reproduction is advantageous for evolution?

Accepted Answer

It increases genetic variation, allowing populations to adapt to changing environments.

Question 10

A mutation occurs in a gene during DNA replication before meiosis. What is the most likely outcome for this mutation?

Accepted Answer

It may be present in some, all, or none of the gametes, depending on crossing over and independent assortment.

Question 11

Which of the following is a direct result of the separation of homologous chromosomes during anaphase I?

Accepted Answer

Each daughter cell receives only one chromosome from each homologous pair.

Question 12

If a plant cell undergoes meiosis and produces gametes, what is the ploidy of the resulting cells?

Accepted Answer

Haploid ($$n)$$

Question 13

Which of the following best describes the role of the synaptonemal complex during meiosis?

Accepted Answer

It holds homologous chromosomes together during synapsis, facilitating crossing over.

Question 14

A geneticist observes that a certain organism produces gametes with abnormal chromosome numbers. Which meiotic event most likely failed?

Accepted Answer

Separation of homologous chromosomes during anaphase I

Question 15

Which equation correctly represents the number of possible chromosome combinations due to independent assortment in a species with a haploid number $$n$$?

Accepted Answer

$$2^n$$

Question 16

Which of the following is NOT a difference between meiosis and mitosis?

Accepted Answer

Meiosis occurs in all cells, while mitosis only occurs in gametes.

Question 17

Which process is responsible for the formation of recombinant chromosomes?

Accepted Answer

Crossing over during prophase I

Question 18

Why does no chromosome replication occur between meiosis I and meiosis II?

Accepted Answer

Because the chromosomes have already replicated during interphase before meiosis I.

Question 19

Which of the following scenarios best illustrates the evolutionary significance of genetic variation produced by meiosis?

Accepted Answer

A population of animals adapting to a new predator due to increased genetic diversity.

Meiosis: Mechanisms and Genetic Variation

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