Question 1

Which of the following best describes the main difference between cytokinesis in plant cells and animal cells?

Accepted Answer

Plant cells build a cell plate from vesicles derived from the Golgi apparatus, while animal cells use a contractile ring of actin and myosin to pinch the cell in two.

Question 2

A cell with 12 chromosomes undergoes mitosis. How many chromosomes will each daughter cell have after cytokinesis?

Accepted Answer

12

Question 3

Which checkpoint in the cell cycle is primarily responsible for ensuring that all chromosomes are properly attached to the spindle before anaphase begins?

Accepted Answer

M (spindle assembly) checkpoint

Question 4

Cyclin-dependent kinases (Cdks) are crucial for cell cycle regulation. Which statement best describes their function?

Accepted Answer

Cdks phosphorylate target proteins only when bound to cyclins, promoting progression through the cell cycle.

Question 5

A cancer cell is characterized by which of the following features?

Accepted Answer

Loss of control over cell division and the ability to divide without external signals

Question 6

During meiosis, when does the chromosome number reduce from diploid to haploid?

Accepted Answer

During meiosis I, after homologous chromosomes separate in anaphase I

Question 7

Which process during meiosis is primarily responsible for generating new combinations of alleles on the same chromosome?

Accepted Answer

Crossing over

Question 8

A diploid organism has a genotype AaBb. According to the principle of independent assortment, what is the expected phenotypic ratio in the F2 generation of a dihybrid cross (AaBb x AaBb) if both traits show complete dominance?

Accepted Answer

$$9:3:3:1$$

Question 9

Which of the following best explains why a test cross is used in genetics?

Accepted Answer

To determine whether an individual with a dominant phenotype is homozygous or heterozygous

Question 10

If a mistake occurs during meiosis II such that one chromosome fails to separate (non-disjunction), what is the possible outcome in the gametes?

Accepted Answer

Half the gametes will be normal, one will have an extra chromosome, and one will be missing a chromosome

Question 11

Which of the following is an example of incomplete dominance?

Accepted Answer

A red-flowered plant crossed with a white-flowered plant produces pink-flowered offspring

Question 12

Which of the following best describes the relationship between chromosomes and sister chromatids after S phase but before anaphase?

Accepted Answer

Each chromosome consists of two identical sister chromatids joined at the centromere

Question 13

Which of the following scenarios illustrates pleiotropy?

Accepted Answer

A single gene affects both fur color and eye color in mice

Question 14

Which of the following best explains how sexual reproduction can help reduce the spread of harmful mutations in a population?

Accepted Answer

Recombination and independent assortment can produce offspring without the harmful mutation

Question 15

A woman who is heterozygous for an X-linked recessive trait and a man who does not have the trait have a child. What is the probability that their son will express the trait?

Accepted Answer

$$0.5$$

Question 16

Which of the following best describes the effect of gene linkage on inheritance patterns?

Accepted Answer

Linked genes tend to be inherited together unless crossing over occurs between them

Question 17

Which of the following is an example of polygenic inheritance?

Accepted Answer

Human skin color, which is influenced by several genes

Question 18

Which of the following best explains how environmental factors can influence phenotype?

Accepted Answer

Environmental factors can affect gene expression, leading to different phenotypes from the same genotype

Question 19

Which of the following best describes the principle of segregation?

Accepted Answer

Each individual has two alleles for each gene, which separate during gamete formation

Question 20

A pedigree shows a trait that appears in every generation and affects both males and females equally. Which mode of inheritance is most likely?

Accepted Answer

Autosomal dominant

Cell Cycle, Meiosis, and Mendelian Genetics: Step-by-Step Study Guidance

Study Guide - Practice Questions

Study Guide - Flashcards