Introduction to evolution
Why is variation essential for evolution to occur?
It allows for good or bad traits to exist for selection.
What aspect of evolution ensures that traits are passed from parents to offspring during sexual reproduction?
Heredity
What crucial element does mutation create, which is necessary for evolution?
Variation
Which factor is responsible for the differences in beak shapes among the finches shown in the diagram?
Natural selection
What are the possible effects of a mutation on an organism's survival chance?
Positive, negative, or neutral
The white fur of a polar bear, allowing it to camouflage in snow, is an example of what?
An adaptation
What is defined as a random change in the genes of an organism's genetic makeup?
A mutation
What is the fundamental definition of evolution?
The process where heritable traits change in a population over time.
Which of the following is a factor needed for evolution?
Natural selection
What would happen if there were no variation in a population?
Organisms would stay the same forever.
What is a trait that increases an organism's chance of survival?
An adaptation
Evolution occurs when natural selection acts upon a population with what characteristic?
Genetic variation.
What concept is illustrated by giraffes with longer necks surviving and passing on their genes, while those with shorter necks do not?
Natural selection
If an organism is well adapted to its environment, what happens to its chances of surviving and having offspring?
They increase.
What is the term for the process where traits are passed on to offspring?
Heredity
What term refers to the differences in the genetic makeup and traits within a population?
Variation
According to the notes, what happens to organisms that are not well-suited for their environment?
They won't survive and cannot pass on genes.
What is the term for the process where heritable traits change in a population over time, helping organisms survive?
Evolution
How does 'Time' relate to the process of evolution?
Evolution is a slow process over many generations.
Which of the following is a characteristic of the 'Time' aspect of evolution?
It happens over many generations.
Which of the following is NOT listed as one of the four aspects of evolution?
Extinction
What can evolution create over a long period of time?
New species
A mutation that decreases an organism's chance of survival is considered what type of mutation?
Negative
Which factor of evolution describes the survival and reproduction of organisms best suited to their environment?
Natural selection
What is the primary purpose of a new trait that evolves in an organism?
To help the organism survive in its current habitat.