Vocabulary
"a group of organisms of the same kind (in one or more populations) that do not reproduce with organisms from any other group"
what is a species?
This introduces new variation to population.
What is a mutation?
This is something that can cause populations to change over time.
What is a change environment?
Which term describes structures that are similar in different species because they come from a common ancestor?
What is Shared Structures
What do taller histogram bars indicate?
What is a great number of individuals with those traits.
"a trait that makes it less likely that an individual will survive in a specific environment"
what is a non-adaptive trait?
The vast majority of mutations do this.
What is nothing?
This is what makes a member of a species unique.
What is a trait?
This process explains how traits become more common over time.
Natural Selection
What does a greater number of histogram bars indicate?
What is a greater amount of variation for that feature.
True or False: Natural selection gives organisms the traits they need to survive.
FALSE: (traits already exist—selection acts on them)
If a mutation results in an adaptive trait, we can expect it to do this over many generations.
What is becomes more common?
What will become more common in populations over time?
What is an adaptive trait?
These preserved remains show how organisms changed over time.
What is Fossils?
What can histograms tell us?
What is the amount of variation of a specific trait in a population.
"any difference in traits between individual organisms"
what is variation?
Remember, (Variation means the differences in traits among individuals in the same species.)
Example (Some trees are taller, some trees are shorter)
A trait is non-adaptive if it does this.
What "keeps the organism from surviving and/or reproducing?"
What can cause individuals to die out without having offspring?
What is a non-adaptive trait?
True or false:
Species that look similar are always closely related.
What is FALSE
Why do we compare histograms from different generations?
What is to see how the variation within a population has changed over time.
"the number of individuals with each trait in a population"
what is distribution?
Occasionally an individual introduces a new trait to a population through a mutation. This can only happen if...?
What is the mutation is an adaptive trait?
Where do offspring inherit traits from?
What is from their parents?
True or False: Fossil records provide complete evidence of ALL organisms that ever lived.
What is FALSE (many organisms never fossilize)
How do we use histograms to predict future generations?
What is by labeling the likely to survive and not likely to survive based on the environment and variation of the trait?