Question 1

Which of the following statements best describes homologous chromosomes in a diploid eukaryotic cell?

Accepted Answer

They are similar in size, centromere location, and banding pattern, and carry the same genes but not necessarily the same alleles.

Question 2

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

Accepted Answer

S phase

Question 3

A human somatic cell contains 46 chromosomes. After mitosis and cytokinesis, how many chromosomes will each daughter cell contain?

Accepted Answer

46 chromosomes

Question 4

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

Accepted Answer

Crossing over between homologous chromosomes

Question 5

If a cell with 2n = 16 chromosomes undergoes meiosis, how many chromosomes will each gamete contain?

Accepted Answer

8 chromosomes

Question 6

Which checkpoint in the cell cycle ensures that all chromosomes are properly aligned before the cell proceeds to anaphase?

Accepted Answer

Spindle assembly (M) checkpoint

Question 7

A mutation in a gene encoding a checkpoint protein can lead to which of the following outcomes?

Accepted Answer

Uncontrolled cell division and increased risk of cancer

Question 8

Which of the following best describes the difference between spermatogenesis and oogenesis in humans?

Accepted Answer

Spermatogenesis results in four functional sperm per meiosis, while oogenesis results in one functional egg and polar bodies.

Question 9

Which formula correctly represents the chromosome number in human gametes compared to somatic cells?

Accepted Answer

$$n = 23$$

Question 10

During which stage of meiosis does synapsis and crossing over occur?

Accepted Answer

Prophase I

Question 11

A cell is observed to have spindle fibers attached to kinetochores and chromosomes aligned at the center of the cell. Which phase is this cell in?

Accepted Answer

Metaphase

Question 12

Which of the following is a direct consequence of a defective cyclin/CDK complex in the cell cycle?

Accepted Answer

Inability to progress through cell cycle checkpoints

Question 13

Which of the following best explains why genetic recombination during meiosis is important for evolution?

Accepted Answer

It increases genetic diversity among offspring.

Question 14

In a species where $$2n = 10$$, how many chromatids are present in a cell at metaphase of mitosis?

Accepted Answer

20 chromatids

Question 15

Which of the following is true regarding the products of mitosis and meiosis II?

Accepted Answer

Both involve separation of sister chromatids.

Question 16

A cell with damaged DNA bypasses the G$$_1$$ checkpoint and continues to divide. What is a likely consequence?

Accepted Answer

The cell may accumulate mutations, potentially leading to cancer.

Question 17

Which of the following best describes the difference between isogamous and heterogamous species?

Accepted Answer

Isogamous species produce morphologically similar gametes, while heterogamous species produce morphologically distinct gametes.

Question 18

Which process ensures that each daughter cell receives the correct number of chromosomes during cell division?

Accepted Answer

Mitotic spindle formation and attachment to kinetochores

Question 19

If a primary oocyte in humans is arrested in prophase I until puberty, what triggers its progression through meiosis I?

Accepted Answer

Hormonal activation at puberty

Question 20

Which of the following is a function of aster microtubules during mitosis?

Accepted Answer

They help position the spindle apparatus within the cell.

Chromosome Transmission During Cell Division and Sexual Reproduction

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