Chapter 15- test your knowledge

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Which of the following are examples of genetic drift

Founder effect and bottleneck effect

A bottleneck is best described as

a reduction in the size of an original population followed by an expansion in size as the surviving members reproduce

which of the following statements is/are true about a non evolving population

allele frequencies do not change over generations. and genotype frequencies do not change over time.

The biological species concept defines a species

on the basis of the ability to mate and produce fertile offspring

Which of the following is not an example of adaptive evolution?

founder effect mutation gene flow bottleneck *all choices are non-adaptive

Which of the following conditions can lead to two populations becoming different species?

Individuals in the two populations mate at different times. Individuals in the two populations have significant genetic differences from one another. A barrier to gene flow exists between the two populations. *All of the above can lead to speciation.

The offspring produced between the mating of a tiger and a lion, a liger, which is unable to reproduce, is an example of which form of reproductive isolation?

hybrid infertility

The proportion of alleles present in a gene pool is called the __________ and is an important tool in measuring evolutionary changes.

allele frequency

Which of the following does not influence allele frequencies in a population?

natural selection. mutation. genetic drift. the bottleneck effect *All of the above influence allele frequencies in a population.

In addition to the beak differences, which of the following indicates the finches found in the Galápagos Islands have experienced speciation?

They can no longer interbreed.

In a population of 75 mice, what would be the size of their gene pool for a particular gene?


The collection of _______ in a population constitutes that population’s gene pool.


You examine a population and note that its allele frequencies for a particular gene are p = 0.55 and q = 0.45. If you come back and examine the population after several generations and found that the values for p and q have not changed, which of the following statements is FALSE for this gene?

The population is evolving.

Which of the following situations would represent a situation that reduces the effect of genetic drift?

The population is very large.

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