Natural Selection
What is the process called when organisms with traits best suited to their environment survive and reproduce?
What is natural selection?
What is sexual selection?
When individuals with traits that attract mates are more likely to reproduce.
A change in DNA or genes.
What is a mutation.
A change in a species over time
What is Evolution
Where did Charles Darwin obtain evidence for his theory of Natural Selection?
The Galapagos
According to Darwin's Theory of Natural Selection, favorable traits.
What is Adaptations
Give an example of a trait that might evolve through sexual selection.
Bright feathers in birds or antlers in deer.
Name one cause of a mutation.
Radiation, chemicals, or mistakes in DNA replication.
What kind of evidence can scientists use to show evolution has happened?
Fossils, DNA, or similarities in body structures.
Why is there competition between individuals of a species?
There is a limited amount of resources
If bacteria become resistant to antibiotics, what process is this an example of?
Evolution through natural selection.
Why might a peacock’s large tail be a disadvantage for survival but an advantage for reproduction?
It makes them easier for predators to see but attracts more mates.
A section of DNA and contains the instructions for building proteins.
What is a gene
What causes some traits to become more common in a population over generations?
Natural selection.
Harmful mutations produce traits that make organisms less likely to survive/reproduce. As a result of natural selection the frequency of harmful alleles become
A population of rabbits has white and brown fur. A snowy winter lasts many years. Which trait will likely become more common, and why?
Brown fur will decrease and white fur will increase because it provides camouflage.
Sexual selection always helps an animal survive longer.
What is False?
What can happen when a mutation occurs on a gene?
A change in the protein
The more genetic variation a population has, the more likely it is for some individuals to
Survive
A genetic mutation that decreases an organisms chance for survival
What is a harmful mutation
What must exist in a population for natural selection to occur?
What is variation in traits?
Explain how sexual selection can lead to exaggerated traits over time.
Because individuals with those traits reproduce more, passing them on generation after generation until they become extreme.
How can a mutation lead to a new trait in an organism?
It can change the protein that’s made, resulting in a new characteristic.
Why is genetic variation important?
genetic variation needed for a population to evolve and survival of the species
The base letters that make up DNA (A,T,G,C).
What is Nucleotides