Question 1

Which of the following statements best explains why meiosis is essential for sexual reproduction in humans?

Accepted Answer

Meiosis ensures that gametes have half the number of chromosomes, maintaining chromosome number across generations.

Question 2

During which phase of mitosis do sister chromatids separate and move toward opposite poles of the cell?

Accepted Answer

Anaphase

Question 3

A human cell with 46 chromosomes undergoes mitosis. After cytokinesis, how many chromosomes will each daughter cell contain?

Accepted Answer

$46$

Question 4

Which of the following best describes homologous chromosomes?

Accepted Answer

They carry the same genes at the same loci but may have different alleles.

Question 5

If nondisjunction occurs during meiosis I, which of the following is a possible outcome?

Accepted Answer

Some gametes will have an extra chromosome, and some will be missing one.

Question 6

Which checkpoint in the cell cycle ensures that DNA replication has occurred correctly before the cell enters mitosis?

Accepted Answer

G2 checkpoint

Question 7

A plant cell is observed to form a cell plate during cytokinesis. What is the primary function of the cell plate?

Accepted Answer

To divide the cytoplasm and form a new cell wall between daughter cells.

Question 8

Which process increases genetic diversity in offspring during meiosis?

Accepted Answer

Independent assortment of homologous pairs

Question 9

A patient is diagnosed with Down syndrome. Which chromosomal abnormality is most likely present?

Accepted Answer

Trisomy 21, with three copies of chromosome 21

Question 10

Which of the following is TRUE regarding cancer cells compared to normal cells?

Accepted Answer

Cancer cells ignore cell cycle checkpoints and divide indefinitely.

Question 11

During metaphase of mitosis, chromosomes align at the center of the cell. What structure do spindle fibers attach to on the chromosomes?

Accepted Answer

Centromere

Question 12

Which of the following best describes the difference between mitosis and meiosis?

Accepted Answer

Mitosis produces two identical cells, while meiosis produces four genetically unique cells.

Question 13

A cell with a diploid number of $2n = 8$ undergoes meiosis. How many chromosomes will each gamete contain?

Accepted Answer

$4$

Question 14

Which event during meiosis contributes most directly to genetic recombination?

Accepted Answer

Crossing over between homologous chromosomes

Question 15

Which of the following is a function of alleles?

Accepted Answer

They are different forms of a gene that determine specific traits.

Question 16

A scientist observes a cell in which chromosomes are condensed and visible, but not yet aligned at the center. Which phase is the cell most likely in?

Accepted Answer

Prophase

Question 17

Which of the following is a result of independent assortment during meiosis?

Accepted Answer

Gametes have different combinations of maternal and paternal chromosomes.

Question 18

Which term refers to the failure of homologous chromosomes or sister chromatids to separate properly during meiosis?

Accepted Answer

Nondisjunction

Question 19

Which of the following best describes the role of genetic counseling?

Accepted Answer

It helps individuals assess the probability of passing down genetic illnesses to their offspring.

Question 20

Which of the following is TRUE about sister chromatids?

Accepted Answer

They are identical copies of a chromosome joined at the centromere.

Cell Division, Chromosomes, and Genetic Variation: Study Notes for General Biology

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