Bellwork 2.12.14 Which of the following is NOT a compound? HCl Cl NaOH OH What of the following is an example of a homogenous mixture? Pure Water Chex Mix Salt water Skittles If the following substances were poured in a graduated cylinder, created a list from bottom to top. Density = 1.05 g/mL 10.7 g/mL .05 g/mL 2.2 g/mL

Agenda Bellwork Objective: SWBAT compare and contrast Lamarck and Darwin’s theory of evolution of adaptations. Notes Guided Practice Independent Practice REMEMBER PROJECTS DUE FEB 21 2014

So, we’ve learned about adaptations… HOW DO ANIMALS ADAPT TO THEIR ENVIRONMENT?

Theories Explaining Evolution Lamarck Darwin

Organisms seem suited for their jobs and environments

BRAINPOP

Lamarck’s Theory Organisms acquire (develop) adaptations to meet their needs in an environment. Specifically, an organism can change its physical traits by using its body in certain ways. The characteristics that an organism acquires during its life are then passed on to offspring.

Lamarck’s theory Crab exercises his claw to make it grow larger Crab passes on the acquired trait to offspring

Narrate this picture! Giraffe Evolution According to Lamarck

Acquired traits are not inherited (Only traits in DNA are inherited) Why was Lamarck Wrong? Acquired traits are not inherited (Only traits in DNA are inherited) 5 ?

X 2. Organisms do not evolve Why was Lamarck Wrong? That giraffe will die! X

Darwins Theory: Natural Selection Organisms born with the best adaptations survive and pass on their traits to offspring. Organisms without these adaptations die and do not reproduce. Overtime, the population changes as more organisms inherit the adaptation.

Darwin’s Theory- Natural Selection Crab is born with a slightly larger claw.

Crab is born with a slightly larger claw. X

X Crab is born with a slightly larger claw. Crab with largest claw survives best and reproduces most.

X X X X X Crab is born with a slightly larger claw. Claw helps crab survive and reproduce X X

X X X X X Crab is born with a slightly larger claw. Claw helps crab survive and reproduce X X Eventually, all crabs have the adaptation -the population evolved.

One day a crab is born with an even larger claw…. Natural selection will occur again and the population will continue to evolve

One day a crab is born with an even larger claw…. …Natural selection will continue and the population evolves further Natural selection will occur again and the population will continue to evolve

Giraffe Evolution According to Darwin ?

Todd the Tortoise By someone on the internet

This is the story of Todd the Tortoise and how he got his shell.

One day Tom saw the love of his life Tina the Tortoise…

They went behind a rock and decided to start a family.

Tina laid many eggs. More were born than can possibly survive.

Natural resources are limited.

Sammy the Snake Enjoys eating tortoise eggs and baby tortoise.

Only a few of the eggs survived to hatch into baby tortoise.

No two individuals were alike and baby Todd had this weird shell on his back.

“C’mon Todd, your so slow.” No two individuals were alike and baby Todd had this weird shell on his back. “C’mon Todd, your so slow.”

Predators such as Sammy the Snake kept populations of tortoise in check.

Predators such as Sammy the Snake kept populations of tortoise in check.

Predators such as Sammy the Snake kept populations of tortoise in check.

Predators such as Sammy the Snake kept populations of tortoise in check.

Predators such as Sammy the Snake kept populations of tortoise in check.

Predators such as Sammy the Snake kept populations of tortoise in check.

Predators such as Sammy the Snake kept populations of tortoise in check.

Predators such as Sammy the Snake kept populations of tortoise in check.

Predators such as Sammy the Snake kept populations of tortoise in check.

Predators such as Sammy the Snake kept populations of tortoise in check.

Predators such as Sammy the Snake kept populations of tortoise in check.

Predators such as Sammy the Snake kept populations of tortoise in check.

Predators such as Sammy the Snake kept populations of tortoise in check.

Predators such as Sammy the Snake kept populations of tortoise in check.

Predators such as Sammy the Snake kept populations of tortoise in check.

Predators such as Sammy the Snake kept populations of tortoise in check.

Predators such as Sammy the Snake kept populations of tortoise in check.

Predators such as Sammy the Snake kept populations of tortoise in check.

Predators such as Sammy the Snake kept populations of tortoise in check.

One day Todd meet another female turtle that had a small shell thing on her back.

They went behind a rock and decided to start a family.

Variation is inheritable and most of the offspring also had this shell.

Todd Jr. bumped into Sammy the snake one day as an adult tortoise.

Todd’s hard shell made it very difficult for Sammy to eat him.

Shelled tortoise began surviving more often and were able to reproduce.

Overtime, more shelled tortoise survived because nature selected their shell for survival.

Their offspring were also shelled. A new species was eventually born.

Their offspring were also shelled. A new species was eventually born. “Who are you?”

The End

Partner Practice Read each of the two theories on your notes, which hypothesize how elephants have evolved to have long trunks. Choose a theory, state whether it demonstrates Lamarck’s theory or natural selection and JUSTIFY your answer with evidence. Theory ________

TRUE OR FALSE- Write a T next to statements that are true according to Darwin’s Theory of Natural Selection. Write an F next to statements that are false, or that describe Lamarckian evolution. ____ Evolution occurs when organisms adapt to meet their needs in an environment ____ Whole populations, not individual organisms, evolve over time based on their environment ____ Adaptations are inherited ____ Adaptations are acquired based on use ____ If an organism is not well adapted to its environment, it dies ____ If an organism struggles in an environment it adapts