Advanced Principles Of Human Genetics And Molecular Diagnostics Practice Tests

Question 1

In a population where the frequency of a recessive disease is 1 in 10,000 ($q^2 = 0.0001$), calculate the frequency of the recessive allele $q$.

Accepted Answer

0.01

Question 2

A patient presents with a translocation between chromosome 9 and 22. How should this mutation be classified?

Accepted Answer

Chromosomal mutation

Answer

Single nucleotide variant

Answer

Genome mutation

Answer

Tandem repeat expansion

Question 3

If the frequency of the dominant allele $p$ is 0.7 in a population in Hardy-Weinberg equilibrium, calculate the expected frequency of the heterozygous genotype ($2pq$).

Accepted Answer

0.42

Question 4

Which of the following conditions must be met for a population to remain in Hardy-Weinberg equilibrium?

Answer

No net mutations

Answer

Random mating

Answer

Large population size

Answer

High rates of migration

Question 5

A sequence analysis reveals a change from 'ATGC' to 'ATGG'. This is an example of which type of mutation?

Accepted Answer

Single nucleotide variant

Answer

Chromosomal translocation

Answer

Genome mutation

Answer

Tandem repeat

Question 6

If a population is in Hardy-Weinberg equilibrium, the frequency of the homozygous recessive genotype ($q^2$) will change significantly over time if the population size is large.

Accepted Answer

False

Answer

True

Question 7

In a population of 1,000 individuals, 40 are homozygous recessive ($aa$) for a trait. Assuming Hardy-Weinberg equilibrium, what is the frequency of the recessive allele $q$?

Accepted Answer

0.2

Question 8

The Human Genome Project, initiated in 1990, provided a foundational reference for modern genomics. Which statement best describes its primary impact on variant analysis?

Accepted Answer

It provided a standard reference sequence to identify deviations and polymorphisms.

Answer

It eliminated all genetic diseases through gene editing.

Answer

It proved that all humans have identical DNA sequences.

Answer

It focused exclusively on the study of chromosomal translocations.

Question 9

Given a disease incidence of 0.09 ($q^2 = 0.09$), calculate the frequency of carriers ($2pq$) in the population.

Accepted Answer

0.42

Question 10

A genetic polymorphism is typically defined as a variant that is common in a population, whereas a mutation is often a rare, causative variant.

Accepted Answer

True

Answer

False

Question 11

A woman has a brother affected by an X-linked recessive disorder. Her mother is a known carrier. The woman is phenotypically normal and has no affected children. Calculate her posterior probability of being a carrier given she has had $n=2$ unaffected sons. Assume the prior probability is $P(C) = 0.5$.

Accepted Answer

0.143

Question 12

In a study of a complex disease, the prevalence in siblings of affected individuals is $0.08$, while the prevalence in the general population is $0.002$. Calculate the relative risk ratio $\lambda_s$ and determine if the disease has a significant genetic component.

Accepted Answer

Option A

Answer

Option B

Answer

Option C

Answer

Option D

Question 13

If a disease follows a multifactorial threshold model, the recurrence risk for first-degree relatives of an affected individual is approximately $\sqrt{K}$, where $K$ is the population prevalence.

Accepted Answer

True

Answer

False

Question 14

A consultand's mother is a carrier of an autosomal recessive condition. The consultand is healthy. Calculate the probability that the consultand is a carrier, given they have had $n=3$ healthy children with a partner who is not a carrier.

Accepted Answer

0.143

Question 15

Which of the following factors influence the recurrence risk of a multifactorial disease in a family? Select all that apply.

Accepted Answer

Option A

Answer

Option B

Answer

Option C

Answer

Option D

Question 16

In a microsatellite analysis, a locus has a repeat unit of $4$ base pairs. If the PCR product for allele $A_1$ is $120$ bp and the product for allele $A_2$ is $132$ bp, calculate the difference in the number of repeat units between these two alleles.

Accepted Answer

3

Answer

2

Answer

4

Answer

12

Question 17

An ASO grid is used to genotype a patient for a specific SNP. The probe for the wild-type allele ($W$) shows a signal, but the probe for the mutant allele ($M$) shows no signal. If the total intensity of the $W$ probe is $I_W = 100$ and the $M$ probe is $I_M = 0$, determine the patient's genotype.

Accepted Answer

Homozygous wild-type

Question 18

A researcher uses FISH to identify the Philadelphia chromosome, which results from a translocation $t(9;22)(q34;q11)$. If a cell shows two normal chromosome $9$ signals, one normal chromosome $22$ signal, and one fusion signal (representing the $BCR-ABL$ gene), how many total fluorescent signals should be observed in a normal diploid cell?

Accepted Answer

Option A

Answer

Option B

Answer

Option C

Answer

Option D

Question 19

In a gene expression microarray experiment, the ratio of fluorescence intensity between a cancer sample ($C$) and a control sample ($N$) is calculated as $R = \frac{I_C}{I_N}$. Which of the following conditions indicate the gene is upregulated in the cancer sample?

Accepted Answer

Option A

Answer

Option B

Answer

Option C

Answer

Option D

Question 20

If a PCR reaction for microsatellite analysis is performed on a heterozygous individual, the resulting gel electrophoresis will show exactly two distinct bands representing the two different allele lengths.

Accepted Answer

True

Answer

False

Advanced Principles Of Human Genetics And Molecular Diagnostics Practice Tests

Practice Tests

Advanced Principles of Human Genetics and Molecular Diagnostics

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