Question 1

Which of the following best defines the term 'heredity' as it relates to inheritance?

Accepted Answer

The transmission of genetic traits from parents to offspring.

Question 2

A human somatic cell contains 46 chromosomes. How many homologous pairs are present in a typical human female somatic cell?

Accepted Answer

$$23$$

Question 3

Which of the following statements correctly compares sexual and asexual reproduction?

Accepted Answer

Sexual reproduction results in offspring with greater genetic variation than asexual reproduction.

Question 4

In humans, which cells are haploid and how many chromosomes do they contain?

Accepted Answer

Gametes; $$23$$ chromosomes

Question 5

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

Accepted Answer

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

Question 6

Which of the following best describes the difference between haploid ($$n) $$and diploid ($$2n) $$cells?

Accepted Answer

Diploid cells contain two sets of chromosomes, while haploid cells contain one set.

Question 7

Which process is unique to meiosis and not found in mitosis?

Accepted Answer

Pairing of homologous chromosomes and crossing over

Question 8

A sporophyte in plants is diploid ($$2n). $$What type of cells does it produce through meiosis, and what is their ploidy?

Accepted Answer

Spores; haploid ($$n)$$

Question 9

Which of the following events increases genetic variation during sexual reproduction?

Accepted Answer

Independent assortment of chromosomes during metaphase I

Question 10

In humans, what is the chromosomal composition of a zygote immediately after fertilization?

Accepted Answer

Diploid ($$2n)$$

Question 11

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

Accepted Answer

Four haploid cells that are genetically unique

Question 12

Which of the following is a direct result of mutations in DNA?

Accepted Answer

Creation of different alleles of a specific gene

Question 13

During metaphase I of meiosis, how are chromosomes aligned at the metaphase plate?

Accepted Answer

Homologous pairs are aligned side by side, with one chromosome from each pair facing opposite poles.

Question 14

Which of the following best explains why sister chromatid cohesion is necessary during meiosis?

Accepted Answer

It allows for proper alignment and separation of homologous chromosomes during meiosis I.

Question 15

Which of the following is true regarding the sex chromosomes in humans?

Accepted Answer

Males have one X and one Y chromosome; females have two X chromosomes.

Question 16

Which process immediately precedes fertilization in the life cycle of fungi and protists?

Accepted Answer

Meiosis

Question 17

A geneticist observes that two genes are located at different loci on the same chromosome. What is the most likely outcome during meiosis?

Accepted Answer

Crossing over may separate the genes, resulting in recombinant chromosomes.

Question 18

Which of the following best describes the fate of a zygote in humans?

Accepted Answer

It divides by mitosis to develop into a multicellular organism.

Question 19

Which of the following is a key difference between spermatogenesis and oogenesis in humans?

Accepted Answer

Spermatogenesis produces four functional sperm cells per diploid cell, while oogenesis produces one functional egg cell and polar bodies.

Question 20

Which of the following mechanisms contributes most directly to the genetic uniqueness of siblings (excluding identical twins)?

Accepted Answer

Random fertilization of gametes

Meiosis and Sexual Life Cycles: Study Guide

Study Guide - Practice Questions