Question 1

Which of the following best describes the difference between asexual and sexual reproduction?

Accepted Answer

Asexual reproduction produces genetically identical offspring, while sexual reproduction increases genetic variability among offspring.

Question 2

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

Accepted Answer

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

Question 3

Which equation correctly represents the chromosome number in a diploid cell after meiosis?

Accepted Answer

$$2n \rightarrow n$$

Question 4

A human somatic cell contains 46 chromosomes. After meiosis, how many chromosomes will each gamete contain?

Accepted Answer

23

Question 5

Which process is responsible for the independent assortment of chromosomes during meiosis?

Accepted Answer

Alignment of homologous chromosomes at metaphase I

Question 6

Which of the following is NOT a source of genetic variation in sexually reproducing organisms?

Accepted Answer

Binary fission

Question 7

If an organism has a haploid number of $$n = 8$$, what is the maximum number of different gamete combinations possible due to independent assortment alone?

Accepted Answer

$$2^8 = 256$

Question 8

Which term describes the pairing of homologous chromosomes during meiosis I?

Accepted Answer

Synapsis

Question 9

A zygote is formed by the fusion of two gametes. If each gamete is genetically unique, which process most directly contributes to this uniqueness?

Accepted Answer

Crossing over during meiosis

Question 10

Which of the following best explains why siblings from the same parents can have different genetic traits?

Accepted Answer

Independent assortment and crossing over during meiosis create unique combinations of alleles in gametes.

Question 11

Which of the following events occurs during meiosis II but not meiosis I?

Accepted Answer

Separation of sister chromatids

Question 12

Which of the following statements about haploid and diploid cells is correct?

Accepted Answer

Somatic cells are diploid, while gametes are haploid.

Question 13

Which process restores the diploid chromosome number in sexually reproducing organisms?

Accepted Answer

Fertilization

Question 14

Which of the following is a direct result of random fertilization?

Accepted Answer

Each offspring has a unique combination of genes from both parents.

Question 15

Which of the following best describes the role of homologous chromosomes in meiosis?

Accepted Answer

They pair and exchange genetic material during meiosis I.

Question 16

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

Accepted Answer

Two gametes will have an abnormal chromosome number, and two will be normal.

Question 17

Which of the following is true regarding the process of fertilization?

Accepted Answer

It combines two haploid gametes to form a diploid zygote.

Question 18

Which term refers to the exchange of genetic material between non-sister chromatids of homologous chromosomes?

Accepted Answer

Crossing over

Question 19

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

Accepted Answer

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

Question 20

Which of the following is a consequence of independent assortment and crossing over during meiosis?

Accepted Answer

Genetic variation among offspring increases.

L13: Meiosis and Genetic Variation

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