Good AfternoonTurn in HW: Batesian Mimicry

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Take out a pen & paper and lets learn some evolution!

From one generation to the next, the struggle for resources will favor individuals with some variations over others and thereby change the frequency of traits within the population. This process is natural selection.

The traits that confer an advantage to those individuals who leave more offspring are called adaptations.

How did these adaptations come to be?

Evolution!

Goals

• Describe the process of evolution using: Variation, Population, Differential reproductive success, Inheritance, Adaptations

Evolution main ideas1. Within every population there are numerous

variations2. Organisms do not live forever, and some do not

live to reproduce3. The variants that already had “helpful”

mutations will more likely survive and reproduce compared to variants without these mutations (Differential Reproductive success [DRS])

4. These favorable mutations are passed on to subsequent generations

Variation

What is the source of the variation?

DRS due to favorable traits

Tweezer

Sugar T

ongs

Big Tongs

Staple Remove

r

Chopsticks

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10

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Predator competition for various prey (poisonous prey absent)

Navy BeansLima BeansMung BeansRed beans

Predator Type

# Pr

ey ca

ptur

ed

Favorable traits get passed on to offspring

Within a population of moths, there was variation (light and dark). While the trees were lighter, the light moths DRS was greater. After the trees darkened, the dark moths DRS became greater. The color of moth gene is inheritable and passed on. Favorable, inherited traits, like the dark color, are adaptations.

Things you need to know about evolution Video

Follow this link:

https://www.youtube.com/watch?v=BDIW7hFTaEE