AIM: How does diversity occur within a species? 4/17/13 DO NOW: 1.Pick up today’s quiz & finish it. HOMEWORK: ILS Review Book 1.Read p. 35-36 2.Answer.

AIM: How does diversity occur within a species?4/17/13DO NOW:1. Pick up today’s quiz &

finish it.

HOMEWORK:ILS Review Book1. Read p. 35-362. Answer Questions #1-42

on the Scan-TronScan-Trons are DUE Tomorrow @ 8 AM

Why are there a variety of traits within a species? Sexual reproductionMutation

Why is variation within the species beneficial?Able to adapt to changes

in the environmentAn advantage in

competition It’s all about survival

How have humans positively impacted the variation of a within a species? Selective breedingGenetic engineering

How have humans negatively impacted the variation within a species?Destroy their living space

or resourcesKill them

How does endangered species differ from an extinct species?Endangered – a species in

danger of dying outExtinct – no more living

organisms of that species

What is a Mutation?A sudden permanent

change in an organism’s genetic material, or DNA.

Are mutations helpful or harmful?Harmful – less able to

surviveHelpful – better adapt to

the environment

What is the theory of evolution?Both individual organisms and whole species change over

time.

How do we know that the modern horse has evolved from a much smaller animal? Fossil evidence

What are fossils?The remains of organisms

that died long ago

What does the layer of rock which a fossil is found indicate? Its ageThe environment in which it

lived

The diagram below shows the changes over time in a population of mice in the wild after a population of hawks has moved into the cold snow-covered environment. The white and dark mice differ only in color.

Explain why there was a change in the population of mice?