3-13-17 warm up

What candy did you pick? Why? Why didn’t you pick the other

types?

There were…now there are

20 snickers4 milky ways4 Three Musketeers66 candy corns17 fruit chews5 mints

Candy• What are the traits of the candy you selected?• What are the traits of the candies you didn’t select?• What if a candy looked good, but inside it was raw

onion? • So, the fact that there were different candies with

different traits resulted in some candies being eaten and others surviving.

• This is what natural selection does with individuals in a population.

• Each individual has unique traits; some traits will help an individual survive and some traits do not.

• Natural selection only acts on the phenotype, not the genotype.

Plans for the week Monday 3-13-17: Natural Selection Lesson Tuesday 3-14-17: Practice with lab equipment; n.s.

lesson Wednesday 3-15-17: Genetic Transformation Lab Thursday 3-16-17: Genetic Transformation Lab &

Report Friday 3-17-17: LAST DAY FOR LATE WORK; Gene

Pool mini-lab

Evolution & Natural Selection

Answer Q1 and Q2 now

Essential Questions My initial answer My best answer

What is biological evolution?

What is natural selection?

What are some observations from nature that can be explained by natural selection?

Evolution Change over time in

the genetic makeup of a population

Natural SelectionOne way evolution can

happen is through natural selection

Artificial Selection The selection & breeding of individuals

that have desired traits Crop plants Livestock Pets

Do not resemble their wild ancestors anymore

Natural selection – is similar to artificial selection except nature, or the environment, “selects” who will survive and mate

1 - not all organisms survive

2 - resources are limited

Observations from Nature

3 – There is variation among organisms

4 - variations are inherited from parents

Conclusion

Individuals with favorable traits survive, reproduce, and pass those traits on to the next generation

This is natural selection

Answer Q1 and Q2 now

Essential Questions My initial answer My best answer

What is biological evolution?

What is natural selection?

What are some observations from nature that can be explained by natural selection?

Misconceptions1. Survival of the fittest = survival of the

strongest2. Evolution is not a “grand plan” that will

lead to perfectly adapted species

3 important points 1. Individuals are selected,

POPULATIONS evolve2. Natural selection acts only

on heritable traits3. natural selection is always

at work PopulationPopulation – a group of interbreeding individuals who live in a particular place at a particular time

Answer Q3 now

Essential Questions My initial answer My best answer

What is biological evolution?

What is natural selection?

What are some observations from nature that can be explained by natural selection?

Natural Selection helps explain many observations

1. Homology - similar traits resulting from a common ancestor

Homologous structuresHomologous structures

2. Embryos - all vert. embryos have tail and throat pouches - they develop into different structures in different species

3. Vestigial Structures - structures of little to no importance to the organism; the remnants of the organism’s ancestors

Femur, pelvis bones

4. Molecular homologies - Genetic similarity among organisms

5. Biogeography - The geographic distribution of species

Closely related species usually found in same geographic region

The Importance of the Theory of Evolution

In science, there is no such thing as “just a theory”

The theory of evolution is a good theory because: explains tons observations and data can be tested It is broad and allows scientists to

make new predictions

Answer Q3 now

Essential Questions My initial answer My best answer

What is biological evolution?

What is natural selection?

What are some observations from nature that can be explained by natural selection?

Choose 1 comic and explain how it demonstrates the process of natural selection