Question 1

Which of the following best describes the difference between telophase and cytokinesis during the cell cycle?

Accepted Answer

Telophase is when the nuclear envelope reforms around separated chromosomes, while cytokinesis is the physical division of the cytoplasm into two daughter cells.

Question 2

A researcher observes a cell with 46 chromosomes in G1 phase. After mitosis, how many chromosomes will each daughter cell have, and what is the DNA content compared to the original cell in G1?

Accepted Answer

Each daughter cell will have 46 chromosomes and the same DNA content as the original cell in G1.

Question 3

Which of the following best explains why cancer cells can continue to divide uncontrollably?

Accepted Answer

They have lost normal cell cycle regulation and do not respond to growth factor signals.

Question 4

During meiosis, crossing-over occurs during which specific stage, and what is its genetic significance?

Accepted Answer

Crossing-over occurs during prophase I and increases genetic variation among gametes.

Question 5

A plant with genotype $$RrYy is $$crossed with a plant with genotype $$rryy. $$What is the probability that an offspring will have the genotype $$Rryy$$? (Assume independent assortment.)

Accepted Answer

$$0.25$$

Question 6

Which of the following scenarios is an example of incomplete dominance?

Accepted Answer

A pink-flowered plant results from crossing a red-flowered plant with a white-flowered plant.

Question 7

Which of the following best describes the law of independent assortment?

Accepted Answer

Each pair of alleles segregates independently of other pairs during gamete formation.

Question 8

A woman who is a carrier for a sex-linked recessive disorder (X-linked) and a man who does not have the disorder have a son. What is the probability that their son will have the disorder?

Accepted Answer

$$0.5$$

Question 9

Which of the following events during meiosis contributes most directly to the genetic uniqueness of gametes?

Accepted Answer

Independent assortment of homologous chromosomes during metaphase I

Question 10

A karyotype is most useful for which of the following purposes?

Accepted Answer

Identifying chromosomal abnormalities such as nondisjunction or structural changes

Question 11

Which of the following best explains why calico cats are almost always female?

Accepted Answer

Calico coloration results from X inactivation, and females have two X chromosomes allowing for mosaic expression.

Question 12

Which of the following is true regarding homologous chromosomes?

Accepted Answer

They carry the same genes but may have different alleles.

Question 13

A cell is observed to be in a phase where the nuclear envelope is fragmented, chromosomes are attached to spindle fibers, and kinetochores are present. Which phase is this?

Accepted Answer

Prometaphase

Question 14

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

Accepted Answer

Plant cells form a cell plate during cytokinesis, while animal cells form a cleavage furrow.

Question 15

If a diploid organism has a genotype $$AaBb$$, how many unique types of gametes can it produce, assuming the genes are on different chromosomes?

Accepted Answer

4

Question 16

Which of the following is an example of pleiotropy?

Accepted Answer

A single gene affects both the color of a mouse's fur and the shape of its tail.

Question 17

A woman with blood type $$IAi$$ and a man with blood type $$IBi$$ have a child. What is the probability that their child will have type AB blood?

Accepted Answer

$$0.25$$

Question 18

Which of the following best describes the role of the SRY gene in mammals?

Accepted Answer

It is located on the Y chromosome and triggers male development.

Question 19

Which of the following is a likely result of nondisjunction during meiosis?

Accepted Answer

Some gametes have an extra chromosome, while others are missing one.

Question 20

Which of the following best explains why Mendel chose pea plants for his genetic experiments?

Accepted Answer

Pea plants have easily observable traits, can self-fertilize, and produce many offspring.

Cell Cycle, Meiosis, and Mendelian Genetics: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards