Question 1

During which phase of the cell cycle does DNA replication occur, and what is the result of this process?

Accepted Answer

DNA replication occurs during the S phase, resulting in each chromosome consisting of two sister chromatids.

Question 2

A researcher observes a cell with chromosomes aligned at the center of the cell, attached to spindle fibers from opposite poles. Which stage of mitosis is being observed, and what is the main event of this stage?

Accepted Answer

Metaphase; chromosomes align at the metaphase plate.

Question 3

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

Accepted Answer

Animal cells form a cleavage furrow, while plant cells form a cell plate.

Question 4

A cell is observed to have 46 chromosomes at the start of mitosis. How many chromosomes will each daughter cell have after mitosis is complete?

Accepted Answer

Each daughter cell will have 46 chromosomes.

Question 5

Which checkpoint in the cell cycle is primarily responsible for determining whether a cell will proceed to DNA synthesis or enter a non-dividing state?

Accepted Answer

G1 checkpoint

Question 6

In a dihybrid cross between two heterozygous individuals (AaBb x AaBb), what is the expected phenotypic ratio in the F2 generation, assuming independent assortment?

Accepted Answer

$$9:3:3:1$$

Question 7

A woman with blood type AB and a man with blood type O have a child. Which blood types are possible for their child?

Accepted Answer

Only A or B

Question 8

Which of the following best explains the Law of Segregation as described by Mendel?

Accepted Answer

Each individual has two alleles for each gene, and these alleles separate during gamete formation.

Question 9

A geneticist is studying a trait controlled by two genes, where one gene can mask the expression of the other. This phenomenon is known as:

Accepted Answer

Epistasis

Question 10

If a plant with genotype $$RrYy ($$where R = round, r = wrinkled, Y = yellow, y = green) is self-crossed, what is the probability of obtaining an offspring with genotype $$rryy$$?

Accepted Answer

$$\frac{1}{16}$$

Question 11

Which of the following is an example of a disorder caused by nondisjunction during meiosis?

Accepted Answer

Down syndrome (Trisomy 21)

Question 12

A male fruit fly with white eyes (an X-linked recessive trait) is crossed with a female with red eyes who is heterozygous for the trait. What percentage of their male offspring will have white eyes?

Accepted Answer

50%

Question 13

Which of the following best describes the process and significance of crossing over during meiosis?

Accepted Answer

Crossing over occurs during prophase I and increases genetic variation by exchanging DNA between homologous chromosomes.

Question 14

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

Question 15

Which of the following statements about homologous chromosomes is correct?

Accepted Answer

They carry the same genes in the same order but may have different alleles.

Question 16

A woman who is a carrier for a recessive X-linked disorder has children with a man who does not have the disorder. What is the probability that their son will have the disorder?

Accepted Answer

$$\frac{1}{2}$$

Question 17

Which of the following best describes the difference between complete dominance and codominance?

Accepted Answer

In complete dominance, the dominant allele masks the recessive allele; in codominance, both alleles are fully expressed in the heterozygote.

Question 18

A genetic map is constructed using recombination frequencies. If two genes are 10 map units apart, what is the expected recombination frequency between them?

Accepted Answer

10%

Question 19

Which of the following best explains why individuals with sickle cell trait (heterozygous for the sickle cell allele) are more resistant to malaria?

Accepted Answer

The presence of both normal and sickle hemoglobin interferes with the malaria parasite's life cycle.

Question 20

A plant species exhibits a wide range of heights, with most individuals being of intermediate height and fewer individuals at the extremes. Which inheritance pattern best explains this observation?

Accepted Answer

Polygenic inheritance

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

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