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Unit 3 and Unit 4 Review

Teacher: Jacobs
Across
The combination of genes in an organism.
Dinosaurs were the dominant animals in this era.
DNA is double stranded while RNA is what.
A farmer sprays a pesticide on his field. Most insects are killed but a couple survive. What step of natural selection is this?
The name that was given to the earth before it divided into different landmasses.
The name of the ship that Darwin sailed.
A whale has a common structure as an alligator and a bird. What are these structures called?
Structures that have no use in an organism.
Down
The gradual change in a species through adaptations over time.
The Theory of Evolution by what?
Type of protein found in all living things that changes the rate of chemical reactions.
Any change or random error in a DNA sequence.
The thing that hold chromatids together.
What was the type of bird found on the Galapagos islands.
Always bonds to cytosine.
The way an organism looks and behaves.