Q: Which equation would you use to calculate the mutation rate per generation in humans, given the number of new mutations and the total number of base pairs?

$$\mu = \frac{\text{Number of new mutations}}{\text{Total number of base pairs}}$$

Question 1

Which of the following best defines a genetic mutation?

Accepted Answer

A change in the DNA sequence that is inherited by daughter DNA molecules.

Question 2

During DNA replication, what is the primary reason mutations arise?

Accepted Answer

Errors made by DNA polymerase that escape proofreading and error-correcting mechanisms.

Question 3

If a gene has only one allele present in a population and the frequency of all mutant alleles is less than 1%, how is this gene classified?

Accepted Answer

Monomorphic

Question 4

Which of the following statements about polymorphic genes is correct?

Accepted Answer

They have more than one allele, all found at frequencies greater than 1%.

Question 5

A mutation changes the DNA sequence from 'tyre' to 'tore'. According to the study materials, what is the likely consequence?

Accepted Answer

Change, but non-functional

Question 6

Which process is responsible for most genetic diversity in nature?

Accepted Answer

Rare mistakes during DNA replication that escape proofreading and error correction.

Question 7

In a population, the frequency of a mutant allele is 5%. How would you classify the gene?

Accepted Answer

Polymorphic

Question 8

Which of the following best describes the relationship between mutations and alleles?

Accepted Answer

Mutations generate alleles, which are sequence variants of a gene.

Question 9

A population of Drosophila melanogaster has three alleles for a gene, each present at a frequency greater than 1%. What term best describes this gene?

Accepted Answer

Polymorphic

Question 10

Which equation would you use to calculate the mutation rate per generation in humans, given the number of new mutations and the total number of base pairs?

Accepted Answer

$$\mu = \frac{	ext{Number of new mutations}}{	ext{Total number of base pairs}}$$

Question 11

Which of the following scenarios would most likely result in a monomorphic gene in a population?

Accepted Answer

A gene where all mutant alleles are present at a frequency less than 1%.

Question 12

Which of the following is NOT a direct consequence of a mutation in a gene?

Accepted Answer

Increase in the frequency of the wild-type allele.

Question 13

If proofreading and error-correcting mechanisms in DNA replication are highly efficient, what is the expected mutation rate?

Accepted Answer

Very low, because most errors are corrected before they become mutations.

Question 14

Which of the following best explains why sickle-cell allele frequencies are higher in populations where malaria is endemic?

Accepted Answer

The sickle-cell allele confers resistance to malaria, increasing its frequency through natural selection.

Question 15

Which of the following is an example of a wild-type allele?

Accepted Answer

An allele that is most common in a population and produces the standard phenotype.

Question 16

A student claims that all mutations result in non-functional proteins. Which of the following best refutes this claim?

Accepted Answer

Some mutations result in changes that are still functional, as shown by the 'tyre' to 'tire' example.

Question 17

Which of the following is a correct statement about allelic frequency in the context of monomorphic and polymorphic genes?

Accepted Answer

Monomorphic genes have all mutant alleles at a frequency less than 1%, while polymorphic genes have multiple alleles at frequencies greater than 1%.

Question 18

Which of the following best describes the outcome of a mutation that changes a gene from wild-type to partially defective?

Accepted Answer

The phenotype may be altered but not completely lost.

Question 19

In a population, a gene has a wild-type allele at 98% frequency and two mutant alleles at 1% each. How would you classify this gene?

Accepted Answer

Polymorphic, because multiple alleles are present at frequencies greater than 1%.

Question 20

Which of the following is a real-world example of how genetic diversity generated by mutations can impact human health?

Accepted Answer

The presence of the sickle-cell allele in populations exposed to malaria, which provides resistance to the disease.

Genetic Diversity: Overview of Mutations

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