Natural selection and selective breeding Flashcards
What is discontinuous variation often caused by?
Discontinuous variation is often caused by genetic factors. Environmental factors often lead to continuous variation.
What type of factor is involved in determining blood group?
Genetic factors only
According to Darwin’s theory of evolution, how do new species evolve?
By natural selection
Which individuals are most likely to survive to reproduce?
Individuals that are well suited to their environment are most likely to survive. They are more likely to reproduce than those poorly suited to their environment.
Which of the following is not a reason why species adapt and change
Having too much food is not a reason why species change. Limited resources and producing too many offspring leads to competition and change.
Which of these is not a problem caused by selective breeding?
Selective breeding involves choosing individuals which have desirable features, such as high crop yield. This can also unintentionally select for health problems.
A gardener takes pollen from one orchid flower and uses it to pollinate a flower on another orchid plant. What method is this a part of?
Selective breeding involves choosing which individuals of a species are allowed to reproduce. Genetic modification involves transferring pieces of DNA.
Why is important to use antibiotics carefully?
Antibiotics should be used carefully to reduce the spread of resistant strains of bacteria, such as MRSA.
Why might antibiotic resistance develop in populations of bacteria?
Some bacteria may have mutations that protect them from the antibiotic. They reproduce and pass the mutations to their offspring. The development of antibiotics is an attempt to overcome the problems this causes.
What type of variation can be passed on to the next generation?
Genetic variation, but not environmental variation, can be passed on to the next generation.
