Natural selection example

• Over time, the climate of an island became drier, which resulted in changes to the populations of various island finch species. Finch populations with a certain beak shape thrived, while those not having that beak shape decreased. Which of the following describes a necessary condition for these changes in the finch populations to occur? A. fewer mutations B. limited food resources

  C. limited beak variations D. overproduction of offspring

  B. limited food resources
• 1. Which of these would have the least effect on natural selection in a subspecies of giraffes that is geographically isolated from other subspecies of giraffes? A. available niches B. existing predators C. chromosome number D. available food resources

  C. chromosome number
• Mutations within a DNA sequence are A. natural processes that produce genetic diversity B. natural processes that always affect the phenotype C. unnatural processes that always affect the phenotype D. unnatural processes that are harmful to genetic diversity

  A
• Which of the following best illustrates natural selection? A. An organism with favorable genetic variations will tend to survive and breed successfully. B. A population monopolizes all of the resources in its habitat, forcing other species to migrate. C. A community whose members work together utilizing all existing resources and migratory routes. D. The largest organisms in a species receive the only breeding opportunities

  A
• A small population of chimpanzees lives in a habitat that undergoes no changes for a long period. How will genetic drift probably affect this population? A. It will accelerate the appearance of new traits. B. It will promote the survival of chimpanzees with beneficial traits. C. It will increase the number of alleles for specific traits. D. It will reduce genetic diversity.

  D
• A small portion of the population that is geographically isolated from the rest of the population runs the risk of decreased. A. genetic drift B. mutation rate C. natural selection D. genetic variation

  A
• Theodosius Dobzhansky discovered that successful species tend to have a wide variety of genes that do not appear to be useful to the species in its present environment. What did this discovery help explain about genetics and the changes that occur in a species over time? Theodosius Dobzhansky discovered that successful species tend to have a wide variety of genes that do not appear to be useful to the species in its present environment. What did this discovery help explain about genetics and the changes that occur in a species over time?


  B