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 Questions #1-42 on the Scan- Tron Scan-Trons are DUE Tomorrow @ 8 AM
Jan 05, 2016
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?