Question 1

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

Accepted Answer

Synapsis and crossing over between homologous chromosomes during prophase I

Question 2

During which phase of meiosis do homologous chromosomes separate, reducing the chromosome number by half?

Accepted Answer

Anaphase I

Question 3

If an organism has a diploid number of $$2n = 8$$, how many possible combinations of chromosomes can be produced in its gametes due to independent assortment alone?

Accepted Answer

$$2^4 = 16$

Question 4

Which of the following best explains why siblings from the same parents can look very different from each other?

Accepted Answer

Crossing over and independent assortment during meiosis create genetic variation

Question 5

A cell with 12 chromosomes undergoes meiosis. How many chromosomes will each resulting gamete contain?

Accepted Answer

6

Question 6

Which of the following mechanisms does NOT contribute to genetic variation in sexually reproducing organisms?

Accepted Answer

Replication of DNA during interphase

Question 7

In humans, how many genetically distinct gametes can be produced by independent assortment alone? (Assume $$n = 23)$$

Accepted Answer

$$2^{23}$$

Question 8

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

Accepted Answer

Synaptonemal complex

Question 9

A geneticist observes a cell in which homologous chromosomes are paired and exchanging segments. Which stage is this cell most likely in?

Accepted Answer

Prophase I

Question 10

Which of the following statements correctly compares mitosis and meiosis?

Accepted Answer

Mitosis produces cells for growth and repair, while meiosis produces gametes

Question 11

If a mutation prevents the breakdown of cohesins at the end of metaphase II, what is the most likely result?

Accepted Answer

Sister chromatids will fail to separate during anaphase II

Question 12

Which of the following best describes the outcome of crossing over?

Accepted Answer

It results in recombinant chromosomes with DNA from both parents

Question 13

A plant cell undergoes meiosis and produces four spores. Which of the following is true about these spores?

Accepted Answer

They are haploid and genetically unique

Question 14

Which phase of meiosis is most similar to mitosis in terms of the events that occur?

Accepted Answer

Meiosis II

Question 15

If a diploid cell with $$2n = 10$$ undergoes meiosis, how many chromosomes will each daughter cell have after meiosis II?

Accepted Answer

5

Question 16

Which of the following is a direct result of independent assortment during meiosis?

Accepted Answer

Each gamete receives a random mix of maternal and paternal chromosomes

Question 17

A human zygote is formed by the fusion of two gametes. Considering only independent assortment, what is the maximum number of possible chromosome combinations in the zygote?

Accepted Answer

$$(2^{23})^2$

Question 18

Which of the following best explains why meiosis is essential for sexual reproduction in animals?

Accepted Answer

It reduces the chromosome number by half, preventing chromosome doubling in each generation

Question 19

During which stage of meiosis do chiasmata become visible and crossing over is completed?

Accepted Answer

Prophase I

Question 20

Which of the following statements about meiosis is FALSE?

Accepted Answer

DNA replication occurs between meiosis I and meiosis II

18: Meiosis and Sexual Life Cycles: Mechanisms and Genetic Variation

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