Gene Frequencies

Someone steps on some bugs and randomly removes their alleles from the population. This is an example of

• gene flow

• genetic drift

• speciation

• allele frequency

There are 3 T alleles and 7 t alleles in a population. Calculate the frequency of the recessive allele.

• 30%

• 70%

• 10%

• 4%

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A drastic reduction in the size of a population that can change allele frequencies is called

• the bottleneck effect

• the founder effect

• the gene flow effect

• the Thanos effect

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Which is not true about cheetah populations?

• They have experienced bottlenecks in their evolutionary history.

• They have high levels of genetic variation.

• They are prone to extinction.

• They are not likely to survive environmental changes due to their similarities.

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Alleles that improve survival will decrease in frequency in the next generation.

• True

• False

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Which is NOT an assumption of Hardy-Weinberg?

• natural selection

• large populations

• no mutations

• no migration

• random mating

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The Amish have a higher frequency of polydactyly (extra fingers) in their community than the general population. This is due to the allele for extra fingers being present in the group that started the Amish community.

• The difference in allele frequency is due to genetic flow.

• The difference in allele frequency is due to the founder effect.

• The difference in allele frequency is due to a bottleneck.

• The difference in allele frequency is due to speciation.

If a population of lizards is isolated on an island, with no new immigrants over many years, any new genetic variations are most likely to come from

• recessive alleles

• natural selection

• mutations

• speciation

Which of the following is incorrect?

• TT - homozygous dominant

• Bb - heterozygous

• aa - homozygous recessive

• Nn - heterozygous recessive

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The allele frequencies of the mouse population in the picture are changing over time. Which is true?

• The population is evolving.

• The population is not evolving.

• The population will go extinct.

• The population's genetic variation is increasing.

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