Question 1

Which of the following best explains how meiosis contributes to genetic diversity in sexually reproducing organisms?

Accepted Answer

Meiosis generates haploid gametes with unique combinations of alleles through crossing over and independent assortment.

Question 2

During which phase of meiosis does crossing over occur, and what is its genetic consequence?

Accepted Answer

Crossing over occurs during Prophase I, producing recombinant chromosomes with new allele combinations.

Question 3

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

Accepted Answer

$$23$$

Question 4

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

Accepted Answer

Formation of tetrads and synapsis of homologous chromosomes

Question 5

If a diploid organism has a chromosome number of $$2n = 8$$, how many possible combinations of chromosomes can result from independent assortment during meiosis?

Accepted Answer

$$2^4 = 16$

Question 6

Which statement correctly describes the difference between autosomes and sex chromosomes in humans?

Accepted Answer

Humans have 22 pairs of autosomes and one pair of sex chromosomes.

Question 7

Which process ensures that each gamete receives only one set of chromosomes?

Accepted Answer

Meiosis

Question 8

A karyotype is most useful for which of the following purposes?

Accepted Answer

Displaying the number and appearance of chromosome pairs in a cell

Question 9

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

Accepted Answer

Any sperm can fertilize any egg, increasing genetic variation among offspring.

Question 10

During Anaphase I of meiosis, which of the following occurs?

Accepted Answer

Homologous chromosome pairs separate, while sister chromatids remain attached.

Question 11

Which equation correctly represents the chromosome number in human gametes after meiosis?

Accepted Answer

$$n = 23$$

Question 12

Which of the following best describes the outcome of meiosis II?

Accepted Answer

Four haploid cells, each genetically unique

Question 13

Why are offspring produced by sexual reproduction genetically different from their parents?

Accepted Answer

Because meiosis and fertilization introduce genetic variation through crossing over, independent assortment, and random fertilization

Question 14

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

Accepted Answer

Replication of DNA during S phase

Question 15

If a cell with a diploid number of $$2n = 6$$ undergoes meiosis, how many chromosomes will each daughter cell have after meiosis II?

Accepted Answer

$$3$$

Question 16

Which of the following statements about homologous chromosomes is correct?

Accepted Answer

They carry the same genes but may have different alleles.

Question 17

What is the primary difference between asexual and sexual reproduction in terms of genetic variation?

Accepted Answer

Sexual reproduction produces genetically unique offspring due to the combination of genes from two parents.

Question 18

Which stage of meiosis is responsible for the independent assortment of chromosomes?

Accepted Answer

Metaphase I

Question 19

A geneticist observes that a child has a unique combination of traits not seen in either parent. Which process most likely contributed to this outcome?

Accepted Answer

Crossing over during meiosis

Question 20

Which of the following best describes the role of meiosis in natural selection?

Accepted Answer

Meiosis increases genetic variation, providing raw material for natural selection to act upon.

Meiosis and Genetic Diversity: Foundations of Heredity and Chromosome Behavior

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