Question 1

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

Accepted Answer

To produce gametes for sexual reproduction that are genetically different

Question 2

During meiosis I, which event is responsible for the reduction of chromosome number from diploid ($$2n) to $$haploid ($$n$$)?

Accepted Answer

Segregation (separation) of homologous chromosomes at anaphase I

Question 3

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

Accepted Answer

Homologous chromosome pairing and crossing over

Question 4

A diploid cell with $$2n = 8$$ undergoes meiosis. How many genetically distinct haploid gametes can be produced, assuming independent assortment and no crossing over?

Accepted Answer

$$2^4 = 16$

Question 5

Which statement correctly distinguishes meiosis from mitosis?

Accepted Answer

Meiosis involves two rounds of cell division and produces gametes, while mitosis involves one round and produces somatic cells.

Question 6

In human females, the gametes produced by meiosis are typically characterized by:

Accepted Answer

A haploid nucleus, large amount of cytoplasm, and many organelles

Question 7

Which of the following events is unique to meiosis and contributes to genetic diversity?

Accepted Answer

Crossing over between homologous chromosomes during prophase I

Question 8

If a multicellular eukaryote has a diploid number of $$2n = 12$$, how many chromosomes will each gamete contain after meiosis?

Accepted Answer

$$6$$

Question 9

Which stage of meiosis is characterized by the synapsis of homologous chromosomes and the formation of chiasmata?

Accepted Answer

Prophase I

Question 10

Why is there no DNA replication between meiosis I and meiosis II?

Accepted Answer

Because the purpose is to reduce the chromosome number to haploid, not to duplicate it again

Question 11

Which of the following best explains why gametes produced by meiosis are genetically unique?

Accepted Answer

Because of crossing over and independent assortment of chromosomes

Question 12

In the context of sexual reproduction, which statement is true regarding the formation of a diploid zygote?

Accepted Answer

It results from the fusion of two haploid gametes

Question 13

Which of the following is NOT a function of meiosis?

Accepted Answer

Production of genetically identical cells for tissue repair

Question 14

During which stage of meiosis do homologous chromosomes separate and migrate to opposite poles?

Accepted Answer

Anaphase I

Question 15

Which of the following is a key difference between gamete formation in male and female animals?

Accepted Answer

Female gametes have a haploid nucleus, large cytoplasm, and many organelles, while male gametes have little cytoplasm and few organelles

Question 16

Which of the following best describes the mechanics of mitosis compared to meiosis?

Accepted Answer

Mitosis involves one round of division following a single round of DNA replication

Question 17

Which process during meiosis is responsible for the mechanical basis of Mendel's law of segregation?

Accepted Answer

Separation of homologous chromosomes during anaphase I

Question 18

A haploid yeast cell fuses with another haploid yeast cell. What is the ploidy of the resulting cell?

Accepted Answer

Diploid

Question 19

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

Accepted Answer

Exchange of genetic material between homologous chromosomes, increasing genetic variation

Meiosis and Sexual Reproduction: Mechanisms and Outcomes

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