Question 1

Which of the following best describes the role of the mitotic spindle during mitosis?

Accepted Answer

It separates sister chromatids by attaching to kinetochores and pulling them toward opposite poles.

Question 2

A researcher observes a cell with two nuclei, each containing a full set of chromosomes, but the cytoplasm has not divided. Which stage of the cell cycle has most likely been completed, and which process has not yet occurred?

Accepted Answer

Mitosis completed; cytokinesis not yet occurred.

Question 3

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

Accepted Answer

M checkpoint

Question 4

In humans, how many chromosomes are present in a somatic cell during metaphase of mitosis?

Accepted Answer

$$92$$

Question 5

Which of the following best explains why offspring produced by sexual reproduction are genetically different from their parents?

Accepted Answer

Because meiosis and fertilization introduce genetic variation through independent assortment, crossing over, and random fertilization.

Question 6

A plant species has a diploid number of $$2n = 16. $$After meiosis, how many chromosomes will each gamete contain?

Accepted Answer

$$8$$

Question 7

During which phase of meiosis does crossing over occur, and what is its significance?

Accepted Answer

Prophase I; it increases genetic diversity by exchanging genetic material between homologous chromosomes.

Question 8

A woman with blood type AB and a man with blood type O have a child. What are the possible blood types of their child?

Accepted Answer

A or B

Question 9

In a dihybrid cross between two heterozygous pea plants ($$YyRr 	imes YyRr$$), what is the expected phenotypic ratio in the F2 generation?

Accepted Answer

$$9:3:3:1$$

Question 10

Which of the following best describes pleiotropy?

Accepted Answer

A single gene affects multiple phenotypic traits.

Question 11

A pedigree shows a trait that skips generations and appears equally in males and females. What is the most likely mode of inheritance?

Accepted Answer

Autosomal recessive

Question 12

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 13

A woman who is a carrier for an X-linked recessive disorder and a man who is unaffected have a son. What is the probability that their son will have the disorder?

Accepted Answer

$$50\%$$

Question 14

Which chromosomal abnormality is responsible for Down syndrome?

Accepted Answer

Trisomy 21

Question 15

If a genetic map shows two genes are 10 map units apart, what is the expected recombination frequency between them?

Accepted Answer

$$10\%$$

Question 16

Which process is responsible for the formation of a Barr body in female mammals?

Accepted Answer

X inactivation

Question 17

A cell with $$2n = 8$$ chromosomes undergoes nondisjunction during meiosis II. What is the possible chromosome number in one of the resulting gametes?

Accepted Answer

$$5$$

Question 18

Which of the following best explains the Law of Independent Assortment?

Accepted Answer

Alleles of different genes assort independently of one another during gamete formation.

Question 19

In Labrador retrievers, one gene determines pigment color (B = black, b = brown), and another gene (E) determines whether pigment is deposited in the fur. If a dog has genotype $$bbEe$$, what color will it be?

Accepted Answer

Brown

Question 20

Which of the following is an example of a multifactorial disorder?

Accepted Answer

Heart disease influenced by both genetic and environmental factors

Cell Division, Meiosis, Mendelian Genetics, and Chromosomal Inheritance: Study Guide (Chapters 9-12)

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