Natural Selection and Selective Breeding

Natural Selection and Selective Breeding

Multiple Choice

A unique set of characteristics that helps organisms survive in its environment

• Adaptations

• function

• selective breeding

Multiple Choice

Natural selection is the

• process through which populations of living organisms adapt and chage

• breeding for a specific trait

Multiple Choice

Selective breeding involves

• process through which populations of living organisms adapt and chage

• breeding for a specific trait

Variations in Genetic Inheritance

• Mutation- a mistake made in an organisms genes. Can be deadly or beneficial

• Evolution- change of a species’ genetic code over time

Charles Darwin and the Finches

• Studied FINCHES (birds) in the GALAPAGOS ISLAND

• Proposed all finches came from a common ancestor

• Finches beak size correlates with size of seed

• Large beaks= large seeds

• Small beaks= small seeds

Open Ended

The island typically recieves 130 mm of rain per year. In 1977 there was a drought and the island recieved 24 mm of rain. Because of the little rain, there were fewer seeds growing and 84% of the birds died of starvation.

Which type of birds do you think survived the drought- finches with big beaks or finches with small beaks? Why?

Poll

Did you enjoy the lesson and did it help you learn?

• A little bit

• NO

• Yes, we should do it more often