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 is observed to have chromosomes aligned at the center of the cell, with spindle fibers attached to kinetochores. Which phase of mitosis is this cell in?

Accepted Answer

Metaphase

Question 3

Which checkpoint in the cell cycle ensures that all chromosomes are properly attached to the spindle before proceeding?

Accepted Answer

M checkpoint (spindle assembly checkpoint)

Question 4

A researcher observes a cell with uncontrolled growth, the ability to invade neighboring tissues, and a failure to respond to normal cell-cycle signals. Which characteristic is NOT typical of cancer cells?

Accepted Answer

High rates of apoptosis

Question 5

During meiosis, when does the reduction in chromosome number from diploid to haploid occur?

Accepted Answer

During meiosis I, when homologous chromosomes separate

Question 6

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

Accepted Answer

Crossing over

Question 7

A diploid cell with $$2n = 8$$ undergoes meiosis. How many chromosomes will each gamete contain after meiosis is complete?

Accepted Answer

$$4$$

Question 8

If a non-disjunction event occurs during meiosis II, what is the expected outcome for the resulting gametes?

Accepted Answer

Half the gametes will be normal, and half will be abnormal.

Question 9

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

Accepted Answer

Sexual reproduction allows recombination, which can separate harmful mutations from beneficial alleles.

Question 10

In Mendel’s monohybrid cross between pure-breeding purple-flowered and white-flowered pea plants, what was the phenotype ratio observed in the F2 generation?

Accepted Answer

$$3$$ purple : $$1$$ white

Question 11

Which of the following best defines the term 'genotype'?

Accepted Answer

The genetic makeup of an organism, including its alleles

Question 12

A heterozygous individual for a single gene with two alleles ($$A$$ and $$a) is $$crossed with a homozygous recessive individual. What is the expected genotype ratio of the offspring?

Accepted Answer

$$1 Aa$$ : $$1 aa$$

Question 13

Which of the following scenarios best illustrates the principle of independent assortment?

Accepted Answer

A gene for flower color and a gene for seed shape are located on different chromosomes and segregate independently during gamete formation.

Question 14

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 15

Which of the following best describes polygenic inheritance?

Accepted Answer

Multiple genes contribute to a single trait, resulting in continuous variation.

Question 16

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

Accepted Answer

Autosomal dominant

Question 17

Which of the following best explains how the transmission of chromosomes during meiosis accounts for Mendel's principle of segregation?

Accepted Answer

Homologous chromosomes separate during meiosis I, so each gamete receives only one allele of each gene.

Question 18

Which of the following is a likely consequence of a mutation in a gene encoding a cell cycle checkpoint protein?

Accepted Answer

Cells may divide uncontrollably, leading to tumor formation.

Question 19

Which of the following best describes the difference between homologous chromosomes and sister chromatids?

Accepted Answer

Homologous chromosomes are similar chromosomes from each parent, while sister chromatids are identical copies formed during DNA replication.

Question 20

A dihybrid cross between two heterozygous individuals ($$AaBb 	imes AaBb) $$produces offspring with four phenotypes in a 9:3:3:1 ratio. Which genetic principle does this illustrate?

Accepted Answer

Principle of independent assortment

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