Chapter 4.1 What is evolution?

Evolution Note-taking – use the handouts to fill in the blanks http://www.pbs.org/wgbh/evolution/educators/teachstuds/svideos.html - click on how we know evolution happens? 7

Graphic Organizer Evolution Adaptations Genetic Mutations Species Evolution Adaptations Genetic Mutations Is caused by:

Evolution ___________is process by which species change over time. Evidence shows that the earliest living things were very simple. Over time, they became more complex . Many species became extinct and replaced by others.

_________: is a group of organisms that look alike and can breed with each other.

Adaptations Living things are found everywhere in the world. How do different organisms survive different climates? All organisms have adaptations. ______________: is a trait or characteristics that helps an organism to survive in its environment.

Fast Facts Adaptations help organisms to Get food Avoid predators Reproduce Move from place to place Build shelters Raise offspring Structural adaptations – involve body parts Camouflage by insects Spines on a cactus Webbed feet of a duck Long trunk of elephant Etc.

Fast facts (con’t.) Behavioral adaptations – actions that aid (help) survival An opossum lying down and playing dead when attacked by other animals A spider’s web spinning A bird’s courting dance Mother’s care for her young

GENE MUTATIONS: _____________- a sudden change in DNA sequence that affects genetic information

Gene Mutations: Species evolve over time. Changes happen in genes that affects an organism(s). If the mutation is positive or neutral, it may be passed from a generation to another. If it’s negative (harmful), an organism can die from it without passing it on.

Graphic Organizer Evolution Adaptations- Genetic Mutations Species Is a group of animals or plants that look alike and can breed with each other Evolution Adaptations- Genetic Mutations Is a gradual change in species over time. Is caused by: Is a trait that helps an organism to survive in its environment Is a sudden change in DNA or gene (can be positive, neutral or negative)

Checking concepts: What is evolution?

What adaptations help birds to live in trees?

Why do you think albinism is a harmful mutation?

Checking concepts: Most scientists believe that new species evolve from ______________. Organisms change over time by the process of _______________. A feature or trait that helps an organism live in a certain environment is an _______________. A sudden change in a gene is a ______________.