Question 1

Which of the following best describes homologous chromosomes?

Accepted Answer

Chromosomes that carry the same genes but may have different alleles.

Question 2

In a diploid organism, how many sets of homologous chromosomes are present?

Accepted Answer

Two sets

Question 3

Which region of the chromosome is the site where spindle microtubules attach during cell division?

Accepted Answer

Centromere

Question 4

During which phase of the cell cycle does DNA replication occur?

Accepted Answer

S phase

Question 5

What is the primary outcome of mitosis in a diploid cell?

Accepted Answer

Two diploid cells genetically identical to the parent cell

Question 6

Which process ensures genetic variety in gametes by exchanging genetic material between homologous chromosomes?

Accepted Answer

Crossing over

Question 7

If a diploid cell has 8 chromosomes, how many chromosomes will each gamete have after meiosis?

Accepted Answer

$$4$$

Question 8

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

Accepted Answer

Homologous chromosomes pair and undergo synapsis

Question 9

What is the function of the synaptonemal complex during meiosis?

Accepted Answer

It joins homologous chromosomes during prophase I.

Question 10

Which statement about independent assortment is correct?

Accepted Answer

It occurs during meiosis and results in gametes with different combinations of maternal and paternal chromosomes.

Question 11

A cell in G2 phase has 12 chromosomes. How many DNA molecules are present in this cell?

Accepted Answer

$$24$$

Question 12

Which of the following best explains why offspring can differ greatly from their parents?

Accepted Answer

Meiosis introduces genetic variation through crossing over and independent assortment.

Question 13

During which stage of mitosis do sister chromatids separate and move toward opposite poles?

Accepted Answer

Anaphase

Question 14

If a diploid organism has a genotype AaBb, how many possible gamete types can be produced due to independent assortment?

Accepted Answer

$$4$$

Question 15

Which checkpoint in the cell cycle ensures that DNA is fully replicated before mitosis begins?

Accepted Answer

G2/M checkpoint

Question 16

What is the result of the reduction division in meiosis I?

Accepted Answer

Cells become haploid, each with one set of chromosomes.

Question 17

Which structure stabilizes the ends of chromosomes?

Accepted Answer

Telomere

Question 18

A cell undergoes mitosis but fails to complete cytokinesis. What is the likely result?

Accepted Answer

One cell with two nuclei

Question 19

Which of the following is true about the origin of replication in chromosomes?

Accepted Answer

It is necessary for DNA synthesis to begin.

Question 20

During crossing over in meiosis, what is exchanged between homologous chromosomes?

Accepted Answer

Genetic material between non-sister chromatids

Chromosomes, Cell Cycle, Mitosis, and Meiosis: Core Concepts in Genetics

Study Guide - Practice Questions