Deck 18: Genetic and Genomic Variation

Question 1

The Black Death was a pandemic spreading across Europe between 1348 and 1350.Estimates state that 30% to 60% of Europe's population died from the Black Death.If we look at Europe's population before the pandemic and compare it to the population several generations later,what are we likely to find?

A)More genetic diversity in later generations
B)Less genetic diversity in later generations
C)Less genetic diversity in earlier generations
D)The same degree of genetic diversity in later as in earlier generations

Answer 1

Less genetic diversity in later generations

Question 2

Which term refers to a random change in allele frequencies,not based on natural selection?

A)Population bottleneck
B)Genetic drift
C)Founder effect
D)Migration effect

Answer 2

Genetic drift

Question 3

Which practice is most likely to result in a change in the Hardy-Weinberg equilibrium of a population or geographic area?

A)Random mating from within the established population
B)Geographic isolation of the established population
C)Assimilation of immigrants into the existing population
D)Preponderance of autosomal dominant traits in the existing population

Answer 3

Assimilation of immigrants into the existing population

Question 4

A group of eight space travelers,four men and four women,settled on the planet Zebulon.Their descendents had a very high rate of the autosomal dominant disorder,Moonophilia distractens.What factor could explain this phenomenon?

A)Equal exposure to an environmental mutagen
B)Hardy-Weinberg equilibrium
C)Variable expressivity
D)Founder effect

Question 5

What pieces of genetic information tend to be passed down from generation to generation with the least variation?

A)Mitochondrial DNA
B)Nuclear DNA
C)Ribosomal DNA
D)Histone proteins

Question 6

Which statement regarding genetic diversity is most accurate?

A)Larger genes are more likely to display diversity than small genes.
B)Genetic diversity is significant only when a population is isolated.
C)Genetic disorders are more common in populations that have greater genetic diversity.
D)Population bottlenecks result in loss of alleles that provide minimal selection advantage.

Question 7

Why is it important to consider population genetics?

A)Natural selection can increase genetic diversity.
B)Accurate assessment of a person's ethnicity can be identified from DNA.
C)Disease risk can vary as a result of the geographic origin of one's ancestors.
D)Knowing ethnicity allows accurate prediction of Huntington disease risk.