Question 1

Which phase of the cell cycle is responsible for the duplication of chromosomes, and what is the main event that occurs during this phase?

Accepted Answer

S phase; DNA synthesis and chromosome duplication occur

Question 2

During mitosis, what is the function of the mitotic spindle, and where does its assembly begin in animal cells?

Accepted Answer

It controls chromosome movement; assembly begins at the centrosome

Question 3

A cell with 46 chromosomes undergoes mitosis. How many chromosomes will each daughter cell have after cytokinesis?

Accepted Answer

46 chromosomes

Question 4

Which structure is responsible for attaching spindle microtubules to chromosomes during mitosis?

Accepted Answer

Kinetochore

Question 5

In which stage of mitosis do chromosomes align at the metaphase plate?

Accepted Answer

Metaphase

Question 6

What is the main difference between mitosis and meiosis in terms of chromosome number in daughter cells?

Accepted Answer

Meiosis produces daughter cells with half the chromosome number of the parent cell

Question 7

Which equation represents the number of possible chromosome combinations due to independent assortment in gametes, where $$n is $$the haploid number?

Accepted Answer

$$2^n$$

Question 8

During which phase of meiosis does crossing over occur, and what is the significance of this event?

Accepted Answer

Prophase I; increases genetic variation

Question 9

A human somatic cell contains 46 chromosomes. After meiosis, how many chromosomes will each gamete contain?

Accepted Answer

23 chromosomes

Question 10

Which mechanism contributes most directly to genetic variation in sexually reproducing organisms?

Accepted Answer

Crossing over during meiosis

Question 11

In animal cells, what is the first visible sign of cytokinesis?

Accepted Answer

Appearance of a cleavage furrow

Question 12

Which of the following best describes the process of binary fission in prokaryotes?

Accepted Answer

Chromosomes replicate, move apart, and the plasma membrane pinches inward

Question 13

What is the term for the specific location of a gene on a chromosome?

Accepted Answer

Locus

Question 14

Which equation correctly represents the diploid chromosome number for humans?

Accepted Answer

$$2n = 46$$

Question 15

During which stage of meiosis are homologous chromosomes separated?

Accepted Answer

Anaphase I

Question 16

Which of the following is NOT a function of cell division in multicellular organisms?

Accepted Answer

Production of gametes by mitosis

Question 17

What is the evolutionary significance of genetic variation produced by sexual reproduction?

Accepted Answer

It allows natural selection to favor advantageous traits

Question 18

Which event is unique to meiosis and does NOT occur in mitosis?

Accepted Answer

Synapsis and crossing over

Question 19

If a plant exhibits alternation of generations, which stage produces haploid spores by meiosis?

Accepted Answer

Sporophyte

Question 20

Which of the following statements about homologous chromosomes is correct?

Accepted Answer

They carry genes controlling the same inherited characters

The Cell Cycle and Meiosis: Structure, Function, and Genetic Variation

Study Guide - Practice Questions