Question 1

Which of the following best describes the main difference between mitosis and meiosis in terms of genetic outcome?

Accepted Answer

Mitosis produces two genetically identical daughter cells, while meiosis produces four genetically diverse haploid cells.

Question 2

A patient is diagnosed with a tumor that is rapidly growing due to unchecked cell division. Which checkpoint failure is most likely responsible for this uncontrolled growth?

Accepted Answer

Failure at the G1 checkpoint, allowing damaged DNA to replicate.

Question 3

During which phase of mitosis do the sister chromatids separate and move toward opposite poles of the cell?

Accepted Answer

Anaphase

Question 4

Which structure is responsible for protecting the ends of eukaryotic chromosomes and preventing the loss of genetic information during DNA replication?

Accepted Answer

Telomere

Question 5

A geneticist is studying a gene with multiple alleles. What is the best definition of an allele?

Accepted Answer

A slightly different version of a gene found at the same locus on homologous chromosomes.

Question 6

Which of the following equations correctly represents the number of possible chromosome combinations in gametes due to independent assortment, where $$n is $$the haploid number of chromosomes?

Accepted Answer

$$2^n$$

Question 7

A mutation occurs in a gene that codes for a critical enzyme. Which type of mutation is most likely to result in a nonfunctional protein due to a shift in the reading frame?

Accepted Answer

Frameshift mutation (insertion or deletion)

Question 8

Which of the following best explains why embryonic stem cell research is controversial?

Accepted Answer

Obtaining embryonic stem cells involves the destruction of human embryos, raising ethical concerns.

Question 9

Which of the following is a real-world application of the polymerase chain reaction (PCR) in biotechnology?

Accepted Answer

Amplifying specific DNA segments for forensic analysis

Question 10

A woman with genotype $$AA$$ for blood type A and a man with genotype $$BO$$ for blood type B have a child. What is the probability that their child will have blood type AB?

Accepted Answer

$$0.5$$

Question 11

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

Accepted Answer

The exchange of genetic material between homologous chromosomes during prophase I

Question 12

A cell is observed to have a contractile ring forming at its equator, pinching the cell into two. This process is known as:

Accepted Answer

Cleavage furrow formation during cytokinesis in animal cells

Question 13

Which of the following statements about the structure of DNA is correct?

Accepted Answer

DNA consists of two antiparallel strands forming a double helix.

Question 14

A man with normal vision (not colorblind) and a woman who is a carrier for red-green colorblindness have a son. What is the probability that their son will be colorblind? (Assume X-linked recessive inheritance.)

Accepted Answer

$$0.5$$

Question 15

Which of the following best explains why Down syndrome (trisomy 21) occurs?

Accepted Answer

Nondisjunction during meiosis leading to an extra copy of chromosome 21

Question 16

Which of the following is an example of polygenic inheritance?

Accepted Answer

Human height

Question 17

In a forensic investigation, DNA samples are compared using short tandem repeats (STRs). Why are STRs useful for identifying individuals?

Accepted Answer

STRs vary greatly in the number of repeats among individuals.

Question 18

Which of the following best describes the central dogma of molecular biology?

Accepted Answer

DNA is transcribed into RNA, which is then translated into protein.

Cell Division, Genetics, and the Molecular Basis of Heredity

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