According to the Darwinian concept of evolution, a giraffe has a long neck because:

1. it was always like that since the beginning
2. during evolution the number of cervical vertebrae got increased
3. its ancestors stretched their necks to get food
4. ancestral giraffes with longer necks got more food and left more surviving offspring

Subtopic:  Theory of Evolution & Lamarckism | Darwin's Theory | Additional Theories of Darwin |
 71%
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A population geneticist finds that a new allele in a population has suddenly increased in frequency. Most likely this allele is:
1. mutating rapidly
2. flowing with emigrants
3. strongly selected for
4. a product of assortative mating

Subtopic:  Theory of Evolution & Lamarckism | Additional Theories of Darwin |
 53%
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