Bell Work 1/5

Take out yesterdays worksheet and answer the summary and fill out the 3 questions you still have

about evolution

HAPPY WEDNESDAY Bellwork: Write down only the bolded red portion and your

answer.

Two species of mice live in a field in the middle of East Texas. One mouse species is WHITE with BLACK spotting. The other is BROWN with WHITE spotting.

After a year, the population of white mice has dramatically decreased, while the population of the brown mice has slightly increased.

Why would this be happening?

CHAMPS

C-ConversationH-HelpA-ActivityM-MovementP-Participation

Instruction

• C-No Talking• H-Raise your hand• A-Take Notes•M-Stay in your seat• P-Take Notes

Set up your page for today’s notes…

• Page: 49• Date: 1-5-16• Title: Natural Selection• Essential Question: How is natural selection

related to adaptation and diversity?• Yes, this is Cornell Notes!!

What is evolution?

Evolution: change in heritable traits of a population over time (generations)

Charles Darwin: contributed more to our understanding of evolution than anyone else

What can affect evolution?

Population Size: limited by environmental factors such as

• Food• Shelter• Water• Predators• Disease• Pollution

BELL WORK (Buff Binder): Open your journal to yesterday’s notes.

Based on what you’ve written so far, try to answer the following question:

How does diversity affect evolution?

Fitness: the ability of an organism to survive and reproduce; results from adaptations

Adaptation: inherited characteristic that increases an organism’s chance of survival

• Successful adaptations will: - make organisms better suited to their

environment - increase fitness

Humans have thousands of adaptations: large brain, opposable thumbs, excellent sensory organs, light, strong skeleton, etc.

What is the primary mechanism of evolution?

Natural selection: individuals with characteristics not well suited to their environment will either die or leave few offspring

* Also called “survival of the fittest” * Observed as changes in a population over time, NOT

individual organisms!

1. A population of giraffes inhabits an area filled with tall trees and vegetation that is located high off of the ground. Within the population of giraffes are individuals with short, medium, and long necks. Which of

the individuals will leave behind the most offspring?

Long necks – they will be able to reach the food better than the others, and will therefore survive longer & leave more offspring

2. Complete the following sentence with the correct answer choice.

Natural selection happens (quickly/slowly) and occurs in (individuals/populations).

3. A brand of fire ant poison claims to kill all ants in two applications. The first application of the poison killed 74% of the fire ants. Three months later, the poison was reapplied but

only killed 39% of the remaining fire ant population. Explain the decrease

in the effectiveness of the ant poison.The remaining ants were resistant to the poison.

What genes will these remaining ants pass to their offspring?

4. Imagine that a small island holds a population of lizards that are all the same (have the same traits). Now

imagine a strong storm sweeps some of the island lizards over to the mainland. On the mainland, there

are new ecosystems for the island lizards to explore. In these new ecosystems, they meet new populations of lizards (with new traits) that they can now breed with. What might happen with regards to the variation that

could be created within the population of island lizards?

(more change, less change, no change)

5. In Madagascar scientists have discovered a moth, Xanthopan morganii praedicta, which has a

30.5 cm long proboscis and feeds from and pollinates Darwin’s orchid, Angraecum

sesquipedale. The orchid has a nectar-producing tube that is 27.9 cm long. How is the moth’s

proboscis size an adaptation for its environment?

The moth has very little competition for its food.

Bunny Simulation

QUICKWRITE

• Answer the essential question (How is natural selection related to adaptation and diversity?)