Question 1

Which of the following best describes the main function of mitosis in multicellular organisms?

Accepted Answer

Repair of damaged tissues and growth by producing identical cells

Question 2

During which phase of the cell cycle does DNA replication occur? Provide the correct phase and its main purpose.

Accepted Answer

S phase; synthesis of DNA to ensure each daughter cell receives a complete set of chromosomes

Question 3

Which equation correctly represents the number of possible gamete combinations due to independent assortment in humans, where $$n = 23$$?

Accepted Answer

$$2^{23}$$

Question 4

What is the primary difference between binary fission and mitosis?

Accepted Answer

Binary fission is a simpler process involving DNA replication and cell splitting, while mitosis involves complex chromosome segregation and nuclear division

Question 5

Which checkpoint in the cell cycle ensures that cells do not proceed to division unless they receive a growth factor signal?

Accepted Answer

G1 checkpoint

Question 6

A cell with a mutation bypasses cell cycle checkpoints and divides uncontrollably. What is the most likely outcome?

Accepted Answer

Formation of a malignant tumor capable of metastasis

Question 7

Which of the following statements about homologous chromosomes is correct?

Accepted Answer

They carry the same genes but may have different alleles

Question 8

During meiosis, crossing over occurs between nonsister chromatids of homologous chromosomes. What is the result of this process?

Accepted Answer

Generation of recombinant chromosomes, increasing genetic variation

Question 9

Which stage of meiosis is responsible for separating homologous chromosomes?

Accepted Answer

Anaphase I

Question 10

If nondisjunction occurs during anaphase II of meiosis, what is the most likely result?

Accepted Answer

Some gametes will have an extra chromosome, and some will lack a chromosome

Question 11

Which equation represents the total number of possible genetic combinations from random fertilization in humans, given $$8,388,608$$ possible gametes from each parent?

Accepted Answer

$$8,388,608^2$

Question 12

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

Accepted Answer

Production of genetically diverse cells for asexual reproduction

Question 13

What is the main structural difference between plant and animal cell cytokinesis?

Accepted Answer

Plant cells form a cell plate due to the rigid cell wall, while animal cells form a cleavage furrow

Question 14

Which term describes a cell with an abnormal number of chromosomes due to nondisjunction?

Accepted Answer

Aneuploidy

Question 15

Which process increases genetic diversity during meiosis by exchanging segments between nonsister chromatids?

Accepted Answer

Crossing over

Question 16

Which of the following best explains why sexual reproduction leads to greater genetic diversity than asexual reproduction?

Accepted Answer

Sexual reproduction involves meiosis and fertilization, which combine genetic material from two parents

Question 17

Which of the following is true about the chromosome number in human somatic cells and gametes?

Accepted Answer

Somatic cells are diploid ($$2n$$), gametes are haploid ($$n)$$

Question 18

Which stage of mitosis is characterized by the separation of sister chromatids to opposite poles of the cell?

Accepted Answer

Anaphase

Question 19

Which of the following is a real-world consequence of nondisjunction during meiosis?

Accepted Answer

Development of conditions such as Down syndrome due to an extra chromosome

Question 20

Which of the following best describes the unity and diversity reflected in mitosis and meiosis?

Accepted Answer

Both processes share basic mechanisms of chromosome segregation, but meiosis introduces genetic variation

Chapter 8

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