Medical Quiz

Population Genetics Quiz


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Albinism is caused by a recessive allele. 1 out of 10 000 in a population is an albino. What is the percentage of albinismc carriers in the population?

A. 0.20%

B. 0.02%

C. 2%

D. 9.90%


A large population of a particular animal has been allowed to breed randomly for a number of generations. After several generations, 16% of the animals display a recessive trait. What proportion of the population is probably heterozygous for this trait?

A. 0.72

B. 0.36

C. 0.48

D. 0.6


Population genetics is the study of ____________ within a population and the forces that change allele frequencies.

A. variation ecology

B. evolutionary genetics

C. genetic variability

D. cytogenesis


In a pea population, R controls the flower colour purpleand r controls the flower colour white. In an isolated pea population, there are 36 white flowers and 64 purple flowers. Assuming the population in Hardy-Weinberg equilibrium, how many of the loci for this gene are occupied by the R allele if 20 of the purple are homozygous dominant?

A. 128

B. 84

C. 56

D. 164


In a population that is in Hardy-Weinberg equilibrium, 1 out of 10 000 babies born is a victim of phenylketonuria (PKU). The victim is a homozygous recessive at the particular locus. What is the frequency of carriers for PKU in the population?

A. 0.0198

B. 0.9801

C. 0.0001

D. 0.0099


In a pea population, R controls the flower colour purpleand r controls the flower colour white. In an isolated pea population, there are 36 white flowers and 64 purple flowers. Assuming the population in Hardy-Weinberg equilibrium, what is the value of q for this population?

A. 0.36

B. 0.8

C. 0.64

D. 0.6


The Hardy-Weinberg equation, p2+2pq+q2=1 is a mathematical representation of a population in equilibrium. The individuals who are homozygous dominant are represented by

A. p2+2pq

B. q2

C. 2pq

D. p2


A large population of a particular animal has been allowed to breed randomly for a number of generations. After several generations, 16% of the animals display a recessive trait. What is the frequency of the recessive allele?

A. 0.4

B. 0.25

C. 0.16

D. 0.5


Which of the following does not characterize a population in Hardy-Weinberg equilibrium?

A. Large population size

B. No natural selection

C. An increasing mutation rate

D. Absence of gene flow


What does q2 in the Hardy-Weinberg equation represent?

A. The homozygous dominant genotype at a given locus

B. The homozygous recessive genotype at a given locus

C. Recessive alleles in a population

D. Dominant alleles in a population


Gene pool refers to

A. all the heritable genes for traits in a population

B. all the gametes produced by a population

C. all the genes that mutate in a single generation

D. the mutated alleles for a particular trait


What does it mean if the population is in equilibrium?

A. All the genes are in equal frequencies

B. The frequency of the alleles and genotypes remain constant from one generation to another

C. The population must be very big

D. There are more than one species in the population


The Hardy-Weinberg formula is useful to calculate the changes in ______________.

A. allele frequencies

B. speciation

C. population size

D. mutation


Haemophilia is caused by a recessive allele on the X chromosome. In a population of 10 000 individuals, it was found that 8 females suffered from the disease. What is the percentage of the males in the population that are haemophiliac?

A. 0.00%

B. 0.28%

C. 2.83%

D. 0.08%




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