Question 1

Which of the following best describes the difference between homologous chromosomes and sister chromatids?

Accepted Answer

Homologous chromosomes are a pair of chromosomes, one from each parent, while sister chromatids are identical copies formed by DNA replication.

Question 2

During which phase do homologous chromosomes line up at the metaphase plate?

Accepted Answer

Metaphase I of meiosis

Question 3

A cell that has just completed telophase I of meiosis is:

Accepted Answer

Haploid, because homologous chromosomes have separated

Question 4

Which of the following best defines a somatic cell?

Accepted Answer

A body cell that is generally diploid

Question 5

In humans, how many chromosomes are present in a gamete after meiosis?

Accepted Answer

23

Question 6

What is the main outcome of crossing over during meiosis?

Accepted Answer

It increases genetic variation in gametes

Question 7

During which stage of meiosis does crossing over typically occur?

Accepted Answer

Prophase I

Question 8

If a cell has 4 chromosomes (2 pairs), how many possible combinations of chromosomes can be produced in its gametes due to independent assortment?

Accepted Answer

$$2^2 = 4$

Question 9

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

Accepted Answer

Replication of DNA during S phase

Question 10

Which event occurs during anaphase I of meiosis?

Accepted Answer

Homologous chromosomes separate and move to opposite poles

Question 11

A germ cell divides to produce:

Accepted Answer

Gametes

Question 12

Which of the following best describes the Law of Independent Assortment?

Accepted Answer

Each pair of alleles segregates independently of other pairs during gamete formation

Question 13

During which stage of meiosis are homologous chromosomes paired up?

Accepted Answer

Meiosis I

Question 14

Which of the following is true about asexual reproduction?

Accepted Answer

Offspring are genetically identical to the parent

Question 15

Which of the following best describes fertilization?

Accepted Answer

The fusion of two gametes to form a zygote

Question 16

During which stage of meiosis do sister chromatids begin to separate?

Accepted Answer

Anaphase II

Question 17

After telophase I of meiosis, the resulting cells are:

Accepted Answer

Haploid

Question 18

Which of the following ensures that each gamete is genetically unique?

Accepted Answer

Crossing over and independent assortment

Question 19

If a human cell has 23 pairs of chromosomes, how many possible combinations of chromosomes can be produced in its gametes due to independent assortment?

Accepted Answer

$$2^{23} = 8$$,388,608$$

Question 20

Which of the following occurs during prophase I of meiosis?

Accepted Answer

Pairing of homologous chromosomes and crossing over

Meiosis, Chromosomes, and Genetic Variation: Guided Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard