Do-Now Wednesday 2/23

Evolution can best be defined as:

• Descent with modification (change) from a pre-existing species

• The divergence (separation) of a new species from an existing species

• Getting bigger, stronger, and faster over the course of a lifetime

• The ability of an organism to survive, reproduce, and pass on its genes to its offspring

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Speciation can best be defined as:

• Descent with modification (change) from a pre-existing species

• The divergence (separation) of a new species from an existing species

• Getting bigger, stronger, and faster over the course of a lifetime

• The ability of an organism to survive, reproduce, and pass on its genes to its offspring

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Fitness can best be defined as:

• Descent with modification (change) from a pre-existing species

• The divergence (separation) of a new species from an existing species

• Getting bigger, stronger, and faster over the course of a lifetime

• The ability of an organism to survive, reproduce, and pass on its genes to its offspring

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A homology can best be described as:

• Similarities of characteristics due to having a common ancestor

• Differences due to having nothing in common

• A type of short Japanese poem

• A type of food produced from dried maize kernels; also called "field corn"

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The image shows how humans, cats, whales, and bats all have similar bone structures.

What type of homology would this be?

• Anatomical or structural homology

• Molecular homology

• Developmental homology

• Homology homology

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The image shows the embryos of several different species at early, middle, and later stages of their embryonic development.

All of the species appear similar at the first stage of development.

What type of homology would this be?

• Anatomical or structural homology

• Molecular homology

• Developmental homology

• Homology homology

The image shows the percentage of amino acids from DNA that different species have in common with humans.

What type of homology would this be?

(Hint: remember that nucleic acids are a type of biomolecule)

• Anatomical or structural homology

• Molecular homology

• Developmental homology

• Homology homology

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The limbs of several organisms are shown in the image. Scientists sometimes compare the limbs of these organisms to look for evidence of common ancestry. These limbs provide evidence of common ancestry because they:

• Have the same basic structure

• Perform the same function

• Are the same size

• Are parts of mammals

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Whales have a pelvic bone and leg bones even though they do not have legs.

These bones are vestigial structures.

Vestigial structures can best be described as:

• Inherited structures that no longer serve any function or purpose

• Structures that an organism must have in order to survive

• Structures that have always existed and will always exist

• Structures that an organism created for itself

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Whales have a pelvic bone and leg bones even though they do not have legs.

These bones suggest that the ancestors of whales:

• Were terrestrial (land-dwelling) mammals

• Were very good swimmers

• Were birds

• Were monkeys

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