Agents of Evolution Crossword Puzzle

QUESTIONS LIST:

• selective pressure : this is exerted on a population due to the environment, and is considered to be a large influence on natural selection as an agent of evolution.
• directional : this type of natural selection causes a change in a constant direction, such as increasing size of a body part.
• stabilizing : this type of natural selection removes the members of a species which display extreme variations, thus reinforcing the average phenotype.
• disruptive : this type of natural selection occurs when the selective pressure causes the individuals with the most typical features to die.
• bimodal : this type of distribution is seen in disruptive selection, where surviving individuals display either of two extreme variations.
• species : this is a group of similar individual organisms which can interbreed with each other and produce fertile offspring.
• population : this group of organisms consists of individuals of a particular species in a specific area at a specific time.
• artificial : this type of selection involves human interference with nature.
• selective breeding : this is another name for artificial selection.
• inseminating : artificially doing this to livestock is an example of artificial selection.
• accidental : this type of selection results from human activity such as oil spills, and using herbicides and pesticides.
• industrial : during the era of this revolution, gas and soot pollution from coal-burning factories had significant environmental impacts.
• biston betularia : during the industrial revolution, this moth population went from being a predominantly light colour to being a predominantly dark colour.
• genetic drift : this is the term for the variation of allele frequencies in small populations, which allows for the disappearance of alleles from the population.
• chance : genetic drift does not produce adaptations and it is caused by this.
• bottleneck : this can occur due to genetic drift when the allele frequency of a main trait in a population is reduced drastically because so many individuals carrying the trait have died.
• founder effect : this can occur due to genetic drift when a few members of a population break away and form their own group.
• gene flow : this term refers to the combination of the gene pools of two populations.
• between : gene flow implies the movement of alleles _ populations.
• within : genetic drift implies the random selection of alleles _ a population, which are not due to natural selection forces.