1 / 16

Physical Adaptations

Physical Adaptations. Animals depend on physical features to: obtain food keep safe build homes withstand weather attract mates. . Physical Adaptations. Examples: shape of a bird's beak number of fingers color of the fur thickness or thinness of fur shape of the nose or ears .

klaus
Download Presentation

Physical Adaptations

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Physical Adaptations • Animals depend on physical features to: • obtain food • keep safe • build homes • withstand weather • attract mates.

  2. Physical Adaptations • Examples: • shape of a bird's beak • number of fingers • color of the fur • thickness or thinness of fur • shape of the nose or ears

  3. Adaptation • The adjustment or changes in behavior, physical features, and structure of an organism to become more suited to an environment.

  4. Natural Selection – Survival of the Fittest Natural selection requires on three things: • Organisms produce more offspring than can survive. • Individuals vary in their characteristics. • Many characteristics are inherited by offspring from their parents.

  5. Logically then....... • Some individuals will be better suited to their environment • They will survive and reproduce more successfully than individuals without those characteristics. • Future generations: contain more genes from better-suited individuals. • Result: characteristics will evolve over time to resemble those of the better-suited ancestors.

  6. Natural Selection • Organisms best adapted to their environment tend to survive. • Survivors give their genetic characteristics to their offspring and to new generations. • Those less adapted, without the right genetic characteristics tend to be ELIMINATED!!!

  7. Natural Selection Video

  8. Peppered Moth Video

  9. Peppered Moths – Adaptation in Action • Two Kinds: • White speckled moth • Black moth • In early 1800’s dark form was very rare. • Dark form caused by dominant mutation that occurs spontaneously.

  10. Peppered moths rest on trees and depend on camouflage for protection.

  11. Peppered Moth • Unpolluted Areas:trees are covered in lichens and the light form of the moth is hard to see. • In mid 1800’s air pollution in British cities covered trees with soot. • In cities dark form became common and light form rare.

  12. Peppered moth • In mid 1950’s pollution controls were introduced in Britain and frequency of the black moth form has declined since then.

  13. Peppered Moth Simulation • http://www2.d125.org/~nfischer/Moth/default.htm • Complete the sheet to accompany the simulation

More Related