Question 1

Which of the following best describes the main purpose of meiosis in sexually reproducing organisms?

Accepted Answer

To reduce the chromosome number by half and increase genetic variation in gametes

Question 2

During which phase of meiosis does crossing over (homologous recombination) occur?

Accepted Answer

Prophase I

Question 3

A cell with $$2n = 6$$ chromosomes undergoes meiosis. How many chromosomes will each gamete contain after meiosis is complete?

Accepted Answer

$$3$$

Question 4

Which of the following events occurs in Anaphase I of meiosis but NOT in mitosis?

Accepted Answer

Homologous chromosomes separate

Question 5

Refer to the images provided. Which image best represents Metaphase I of meiosis?

Accepted Answer

Image 3 (homologous pairs aligned at the metaphase plate)

Question 6

If nondisjunction occurs during Meiosis II, what is the most likely outcome for the resulting gametes?

Accepted Answer

One gamete will have an extra chromosome, one will be missing one, and two will be normal

Question 7

Which of the following statements about homologous chromosomes is TRUE?

Accepted Answer

They carry the same genes but may have different alleles

Question 8

After DNA replication but before meiotic cell division, a diploid cell contains:

Accepted Answer

Four copies of every gene

Question 9

Which process is responsible for maintaining the chromosome number (ploidy) in a population across generations?

Accepted Answer

Meiosis

Question 10

A geneticist observes a zygote with $$2n + 1$$ chromosomes. What is the most likely explanation?

Accepted Answer

Nondisjunction occurred during meiosis, resulting in aneuploidy

Question 11

Which of the following best explains why meiosis increases genetic variation in a population?

Accepted Answer

It involves crossing over and independent assortment

Question 12

Which of the following is a key difference between metaphase of mitosis and metaphase I of meiosis?

Accepted Answer

Chromosomes align as single file in mitosis, but as homologous pairs in meiosis I

Question 13

Which of the following is NOT a consequence of errors during meiosis?

Accepted Answer

Doubling of chromosome number in each generation

Question 14

Which of the following best describes a haploid cell?

Accepted Answer

A cell with one set of chromosomes

Question 15

Which of the following events occurs during Meiosis II but NOT during Meiosis I?

Accepted Answer

Separation of sister chromatids

Question 16

If a diploid organism has $$n = 8$$, how many chromosomes will be present in each gamete after meiosis?

Accepted Answer

$$4$$

Question 17

Which of the following is TRUE about sister chromatids?

Accepted Answer

They are identical copies formed during DNA replication

Question 18

Which of the following best explains why chromosome number would double each generation without meiosis?

Accepted Answer

Gametes would be diploid and fertilization would combine two diploid sets

Question 19

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 20

After meiosis, each gamete contains:

Accepted Answer

One copy of every gene

Meiosis: Mechanisms, Chromosome Behavior, and Genetic Variation

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