What is the definition of the term 'gene pool'?
All of the genes that exist within a population
All of the genes and their different alleles that exist within a species
The different alleles that exist for one gene within a species
All of the genes and their different alleles that exist within a single population
An example of a trait that evolved by natural selection is body size in fish, which has declined with warming ocean temperatures.
State the type of selection that this change represents.
Allopatric
Directional
Disruptive
Stabilizing
Which of the following is a feature that is shared between gradualism and punctuated equilibrium?
The presence of vestigial structures
The duration of the process
The occurrence of mass extinctions
The presence of evidence in the fossil record
The genus Allium has species that are used widely in agriculture. Many of these species have been bred to be polyploid.
Which of the following is not a benefit that comes from breeding polyploid crop plants?
Increases hybrid vigour
Reduces the risk of recessive mutations causing detrimental effects
When populations exist in the same area it can lead to allopatric speciation, which produces more varieties that can be sold
Permits novel phenotypes to be generated
Which of the following causes evolution?
Change in allele frequency over time
Change in the total number of alleles due to mutation
Change in geographic distribution
Change in population size
