Question 1

Which of the following best describes the difference between mitosis and meiosis in terms of genetic diversity?

Accepted Answer

Mitosis produces genetically identical daughter cells, while meiosis produces genetically diverse gametes due to crossing over and independent assortment.

Question 2

During which phase of the cell cycle does DNA replication occur, and what is the result in terms of chromatids?

Accepted Answer

DNA replication occurs during the S phase, resulting in each chromosome consisting of two sister chromatids joined at the centromere.

Question 3

A human cell in G1 phase contains 46 chromosomes. How many chromatids will be present in the same cell during G2 phase?

Accepted Answer

$$92$$

Question 4

Which structure is responsible for organizing spindle fibers during mitosis in animal cells?

Accepted Answer

Centrioles

Question 5

What is the primary function of the kinetochore during cell division?

Accepted Answer

To attach spindle microtubules to the centromere of each chromosome, facilitating chromosome movement.

Question 6

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

Accepted Answer

Crossing over between homologous chromosomes.

Question 7

A diploid organism has $$2n = 8$$ chromosomes. After meiosis II, how many chromosomes and chromatids will each gamete contain?

Accepted Answer

$$n = 4$$ chromosomes and $$4$$ chromatids

Question 8

Which of the following best explains why aneuploidy can result from errors during meiosis?

Accepted Answer

Nondisjunction during meiosis leads to gametes with abnormal numbers of chromosomes.

Question 9

Which of the following statements about homologous chromosomes is correct?

Accepted Answer

They have the same genes but may have different alleles.

Question 10

In oogenesis, why does only one of the four cells produced during meiosis become a functional egg?

Accepted Answer

The divisions are asymmetric, resulting in one large cell (the egg) and smaller polar bodies that degenerate.

Question 11

Which phase of mitosis is characterized by the alignment of chromosomes along the metaphase plate?

Accepted Answer

Metaphase

Question 12

A mutation causes the centromere to fail to form on a chromosome. What is the most likely consequence during mitosis?

Accepted Answer

The chromosome will not attach to spindle fibers and may not segregate properly.

Question 13

Which of the following best describes the difference between somatic cells and germ cells?

Accepted Answer

Somatic cells are body cells that divide by mitosis, while germ cells give rise to gametes through meiosis.

Question 14

Which of the following is a real-life consequence of errors in chromosome segregation during meiosis in humans?

Accepted Answer

Down syndrome, caused by trisomy 21.

Question 15

Which of the following equations correctly represents the number of possible combinations of chromosomes in gametes due to independent assortment, where $$n is $$the haploid number?

Accepted Answer

$$2^n$$

Question 16

Which of the following best explains why crossing over during meiosis is important for evolution?

Accepted Answer

It increases genetic variation by exchanging DNA between homologous chromosomes.

Question 17

Which of the following is NOT a feature of prokaryotic chromosomes?

Accepted Answer

They are linear and found inside a nucleus.

Question 18

A cell is observed to have chromosomes aligned in a double row at the metaphase plate. Which process is most likely occurring?

Accepted Answer

Metaphase I of meiosis

Question 19

Which of the following best describes the G0 phase of the cell cycle?

Accepted Answer

A non-dividing state where cells have exited the cell cycle, such as nerve cells.

Question 20

Which of the following statements about the centromere is correct?

Accepted Answer

It is the region where sister chromatids are joined and where the kinetochore forms.

Mitosis and Meiosis: Cellular Basis of Genetic Inheritance

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