Lamarck vs Darwin

What did Lamarck believed?

• Acquired changes were passed to offspring

• If a body part were used, it got stronger

• If body part NOT used, it deteriorated

• Survival of the fittest

• Natural selection

What did Darwin believed?

• All living organisms have evolved from simpler forms

• Traits acquired during one's lifetime would be passed to offspring

• All creatures were linked by a 'foundation of life'

• Survival of the fittest

• Natural selection

What was Lamarck's Theory of Evolution on giraffes?

• 1. Original short-necked ancestor.

  2. Keeps stretching neck to reach leaves higher up on tree.

  3. And stretching.

  4. And stretching until neck becomes progressively longer.

• 1. Survival of the fittest or natural selection.

  2. Natural selection said the giraffes with short necks had less food to eat.

  3. Short necks could not reach upper branches and did not survive.

  4. Long necks survived & reproduced because they were able to reach the food.

What was Darwin's Theory of Evolution on giraffes?

• 1. Original short-necked ancestor.

  2. Keeps stretching neck to reach leaves higher up on tree.

  3. And stretching.

  4. And stretching until neck becomes progressively longer.

• 1. Survival of the fittest or natural selection.

  2. Natural selection said the giraffes with short necks had less food to eat.

  3. Short necks could not reach upper branches and did not survive.

  4. Long necks survived & reproduced because they were able to reach the food.

Was Lamarck's Theory of Evolution correct?

• Yes

• No

What is Acquired Characteristics?

• Traits an organism develops during its own lifetime cannot be passed to offspring

• Process by which organisms with variations most suited to their local environment survive and leave more offspring

• Nature provides the variations, and humans select those they find useful

What is Natural Selection?

• Traits an organism develops during its own lifetime cannot be passed to offspring

• Process by which organisms with variations most suited to their local environment survive and leave more offspring

• Nature provides the variations, and humans select those they find useful

What is Artificial Selection?

• Traits an organism develops during its own lifetime cannot be passed to offspring

• Process by which organisms with variations most suited to their local environment survive and leave more offspring

• Nature provides the variations, and humans select those they find useful

What was Darwin's finding in finches?

• Variations between the same species on different islands.

• Variations between the different species on same islands.

• No variations between the same species on different islands.

• No variations between the different species on same islands.