Question 1

Which of the following statements best distinguishes asexual from sexual reproduction?

Accepted Answer

Asexual reproduction produces offspring genetically identical to the parent, while sexual reproduction produces genetically unique offspring.

Question 2

In humans, which of the following cells are haploid?

Accepted Answer

Gametes

Question 3

What is the main purpose of meiosis in sexually reproducing organisms?

Accepted Answer

To reduce the chromosome number by half, creating haploid gametes

Question 4

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

Accepted Answer

Homologous chromosomes pair and crossing over occurs

Question 5

If a diploid organism has a haploid number $$n = 8$$, how many possible combinations of chromosomes can be produced by independent assortment during meiosis?

Accepted Answer

$$2^8 = 256$

Question 6

Which of the following best describes the difference between autosomes and sex chromosomes in humans?

Accepted Answer

Autosomes are present in pairs in both males and females, while sex chromosomes differ between males and females.

Question 7

During which phase of meiosis do homologous chromosomes separate and move toward opposite poles?

Accepted Answer

Anaphase I

Question 8

Which process is responsible for the genetic variation seen in offspring produced by sexual reproduction?

Accepted Answer

All of the above

Question 9

A plant species has a life cycle that includes both a multicellular haploid and a multicellular diploid stage. What is this type of life cycle called?

Accepted Answer

Alternation of generations

Question 10

Which of the following statements about the zygote is correct?

Accepted Answer

It is diploid and forms after fertilization.

Question 11

Which of the following best explains why meiosis must alternate with fertilization in all sexual life cycles?

Accepted Answer

To ensure that chromosome number is halved and then restored in each generation

Question 12

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

Accepted Answer

Prophase I; it increases genetic variation by exchanging DNA between homologous chromosomes

Question 13

A human cell with 46 chromosomes undergoes meiosis. How many chromosomes will each resulting gamete contain?

Accepted Answer

23

Question 14

Which of the following is NOT a mechanism that contributes to genetic variation in sexually reproducing organisms?

Accepted Answer

Replication of DNA without mutation

Question 15

Which of the following best describes the process of synapsis?

Accepted Answer

The pairing of homologous chromosomes during prophase I of meiosis

Question 16

If a mutation occurs in a gene located on an autosome, which of the following cells could potentially pass this mutation to the next generation?

Accepted Answer

A sperm cell

Question 17

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

Accepted Answer

Separation of sister chromatids

Question 18

A zygote divides by mitosis to form a multicellular organism. Which statement best describes the chromosome number in the cells of this organism?

Accepted Answer

All cells are diploid

Question 19

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

Accepted Answer

Formation of recombinant chromosomes

Question 20

In a certain plant, the sporophyte produces spores by meiosis. These spores grow into multicellular gametophytes. What process do the gametophytes use to produce gametes?

Accepted Answer

Mitosis

Meiosis and the Sexual Life Cycle: Mechanisms, Stages, and Genetic Variation

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