Question

Which condition can lead to two populations becoming different species?
all of these A barrier to gene flow exists between the two populations. Individuals in the two populations have significant genetic differences from one another. Individuals may live in geographically isolated areas. Individuals in the two populations mate at different times.

	Which of these is NOT an example of adaptive evolution?
	bottleneck all of these gene flow founder effect Mutation

Which of these does NOT influence allele frequencies in a population? mutation genetic drift the bottleneck effect all of these natural selection

All of Darwin's finches came from a single species with a "normal" beak. Which factor can explain the development of the variety of beaks seen in these finches today?

Different mutations in beak shape occurred in different populations of finches. None of these explain the variety of beaks. Different food sources on each island created selection pressure for different beak shapes on each island. All of these factors help explain the variety of beaks. Genetic drift resulted in different islands having different allele frequencies for the genes controlling beak shape.

Answer 1

1. all of these

All of the given conditions can contribute to two populations becoming different species. Two populations can become different species if a barrier to gene flow exists between the two populations, individuals in the two populations have significant genetic differences from one another, individuals may live in geographically isolated areas or individuals in the two populations mate at different times.

2. all of these

All the choices are examples of non adaptive evolution

3. all of these

mutation, genetic drift, bottleneck effect and natural selection all influence allele frequency in a population

4. All of these factors help explain the variety of beaks

The factors that help explain the development of the variety of beaks seen in finches today are different mutations in beak shape occurred in different populations of finches, different food sources on each island created selection pressure for different beak shapes on each island and genetic drift resulted in different islands having different allele frequencies for the genes controlling beak shape.