Question 1

Which of the following best describes the difference between binary fission in prokaryotes and mitosis in eukaryotes?

Accepted Answer

Binary fission does not involve the breakdown of the nuclear envelope, while mitosis does.

Question 2

During which phase of the cell cycle does DNA replication occur?

Accepted Answer

S phase

Question 3

A cell with a diploid number of 8 undergoes mitosis. How many chromosomes will each daughter cell have after cytokinesis?

Accepted Answer

$$8$$

Question 4

Which of the following is a key difference between meiosis and mitosis?

Accepted Answer

Meiosis results in four genetically unique haploid cells, while mitosis results in two genetically identical diploid cells.

Question 5

Which of the following best explains why crossing over during meiosis increases genetic diversity?

Accepted Answer

It results in the exchange of genetic material between homologous chromosomes, creating new allele combinations.

Question 6

A woman with blood type A (genotype $$I^A i) $$and a man with blood type B (genotype $$I^B i) $$have a child. What is the probability that their child will have blood type O?

Accepted Answer

$$0.25$$

Question 7

Which of the following scenarios best illustrates the concept of incomplete dominance?

Accepted Answer

A red-flowered plant and a white-flowered plant produce offspring with pink flowers.

Question 8

If a cell fails to pass the G1 checkpoint, what is the most likely outcome?

Accepted Answer

The cell will undergo apoptosis or enter a non-dividing state (G0).

Question 9

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

Accepted Answer

Alleles for different genes segregate independently during gamete formation.

Question 10

A geneticist is studying a trait controlled by a single gene with two alleles. If the trait shows a 3:1 ratio in the F2 generation, what type of inheritance is most likely?

Accepted Answer

Simple Mendelian dominance

Question 11

Which of the following is true about X-linked recessive inheritance?

Accepted Answer

Males are more likely to express the trait because they have only one X chromosome.

Question 12

Which of the following best explains why cancer can result from mutations in genes that regulate the cell cycle?

Accepted Answer

Mutations can cause uncontrolled cell division by disrupting normal checkpoint controls.

Question 13

A couple are both carriers for cystic fibrosis, an autosomal recessive disorder. What is the probability that their child will have cystic fibrosis?

Accepted Answer

$$0.25$$

Question 14

Which of the following is an example of a phenotype?

Accepted Answer

Blue eye color

Question 15

Which process is responsible for the separation of homologous chromosomes during meiosis?

Accepted Answer

Anaphase I

Question 16

If a mutation occurs in a somatic cell, which of the following is true?

Accepted Answer

The mutation will not be passed to offspring.

Question 17

Which of the following best describes the function of cyclins in the cell cycle?

Accepted Answer

Cyclins regulate the timing of the cell cycle by activating cyclin-dependent kinases.

Question 18

Which of the following is a real-world example of codominance?

Accepted Answer

A person with AB blood type expresses both A and B antigens.

Question 19

Which of the following best explains why linked genes do not always assort independently?

Accepted Answer

Linked genes are located close together on the same chromosome and tend to be inherited together.

Question 20

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

Accepted Answer

$$0.5$$

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