Living Environment Evolution
What were the first living organisms like?
Simple and singled celled
What is a theory?
A concept that is tested and confirmed many times and make preditions about science around the world.
Why is the fossil record one of the stongest pieces of evolutionary evidence?
It shows all of the environmental changes over time.
What is natural selection?
A process that chooses the stronger organisms for survival. Like survival of the fitest.
What is artificial selection?
When humans intentionally breed animals for their strong characteristics.
What is overproduction?
The potential for a species to make a lot of itself or already have a lot of itself.
What is variation within a species?
The differences in the species. It is vital for survival. It helps evolution because the organisms need different traits in order to survive as the weak ones die off.
What is competition or struggle for survivval?
It is the fighting for a limited resources. It is needed to help kill out the weak.
What is adaptive value?
The value the trait has to help an organism survive. The more adaptive value, the more likely the rate of survival will be.
Why is kreproduction necessary to natural selection?
The stronger people reproduce and now the new organisms have the stronger gene also.
What are the only mutations that will be seen in the offspring of an organism?
The ones that occur in the gametes of an individual.
What is a mutation?
A change in the base sequence of DNA
What determines if a mutation is beneficial?
It helps the organism survive longer.
Which processes in sexual reproduction provide variation in an organism?
Fertilization and meiosis
How does meiosis scramble the genes and provide variation?
It divides chromosomes after shuffling them around and crossing over certain characteristics and they can be divided into four cells.
How does fertilization scramble the genes and provide variation?
The two sets of chromosomes are now reunited, and they come from different people.
What is similar about homologous structures?
Their shape and structure.
What is different about homologous strucutres?
The function of the structure
How do vestigial strucutres like the tail bone in a human help to show evolution?
It shows that once the organism needed the strucutre to survive but now it does not and you can related it to other organisms.
Why is genetic variation vital to the survival of a species?
Without variation, certain organisms won't survive and could be wiped out by one change in the environment they are in.
How fast is evolution and what controls how fast it changes?
It generally occurs slowly. It depends on the environmental changes and the variation in a species.
Why can insects and bacteria adapt quickly?
They reproduce fast.
Why do species go extinct?
They are not adapted to their environment.
Living Environment Evolution
Review of Evolution for Living Environment Regents Exam.