Review And Assessment Flashcards
Two organisms that can mate and produce fertile offspring that are members of the same _____________.
Species
Why are Darwin’s ideas classified as a scientific theory?
Darwin’s ideas explain how things change over time by natural selection and form evidence.
What is one factor that affects natural selection? Give an example.
Overproduction, because there may not be enough resources for all the offspring only those that are better adapted will survive.
Identify one similarity and one difference between natural selection and artificial selection.
In artificial selection humans choose the traits, but in natural selection environmental factors determine the traits.
Similar structures that related species have inherited from a common ancestor are called.
Homologous Structures
The more ____________ the DNA sequences between two organisms are, the more closely related the two species are.
Similar
Look at the drawing, at the right, of the bones in a crocodile’s leg. Do you think that crocodiles share a common ancestor with the birds, Dolphins, and dogs? Support you answer with evidence.
Crocodiles do you share a common ancestor because of similar structures of the bones in the legs.
What type of evidence is the best indicator of how closely to species are related? Explain your answer.
The similarities between DNA and protein structures are the best indicators. Both DNA and protein structures are highly specific.
A trait that helps an organism to survive and reproduce is called a(n)
Adaptation
