Mutations can alter the genes of individuals in a beneficial or detrimental way and introduce variety into a species.
What is a mutation?
A change to an organism's appearance
A change to an organism's behaviour
A change to an organism's genetic material
How can you increase the rate of mutation?
By natural selection
What can cause variation?
Changes in the environment
What can cause variation to be passed on to offspring?
Less well-adapted individuals cannot reproduce
Most well-adapted individuals can reproduce
Reproduction involves passing on genes
What are the only types of characteristics that can be passed on by inheritance?
Those that make an organism more likely to survive and reproduce
Those that are present in all the organisms in a population
Those that are the result of the genes an organism possesses
What is meant when an organism is described as having a 'selective advantage'?
The organism can change to help it survive and reproduce in its environment
The organism has characteristics that help it to survive and reproduce in its environment
The organism is unable to survive and reproduce in its environment
Which of the following is an example of evolution by natural selection?
A giraffe increasing its neck length by stretching to reach the top of a tree
A human increasing the size of their muscles as a result of training
An increase in the number of drug resistant bacteria in a population
What is the correct order for the events of speciation?
During speciation when do two groups of organisms become separate species?
When they become isolated from each other
When they cannot interbreed to produce fertile offspring
When they look different
Which of the following is an example of a selection pressure?
Competition for food