Lesson 2- Natural Selection Flashcards
What are factors that affect the process of natural selection?
Overproduction, variation, and competition.
Darwin knew that most species produce far more offspring than can possibly survive. What factor that affects the process of natural selection is this?
Over production.
What is any difference between individuals of the same species
Variation
Since food, Space, and other resources are limited, the members of a species must compete with one another to survive what is this called?
Competition
Darwin observed that some variations make individuals better adapted to their environment. What is this called?
Selection
What did Darwin propose?
He proposed that over a long time, natural selection can lead to change.
What is a change in the environment that can affect individuals, organisms with specific traits, or entire species?
Environmental change
Where do variations come from and how are they passed on from parents to offspring?
Genes and natural selection
What can Darwin not explain?
Darwin could not explain what caused variations or how they were passed on
What did scientists later learn about variations and genes?
As scientists later learned, variations can result from changes in genes and the shuffling or of different forms of genes when egg and sperm join
how do lifeforms change over time?
Their gene variation could change, so it might affect the food it eats or the environment it lives in.
Explain how unfavorable trace can disappear and species
Overtime the gene variation might change. A change in the environment can affect individuals organisms with specific species or entire species
What is the process by which individuals that are better adapted to their environment are more likely to survive and reproduce more than other members of the same species?
Natural selection
