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N5-LE6-Evolution of species
Terms in this set (16)
a spontaneous, random change in genetic material
Types of mutation
Neutral, advantageous, disadvantageous
Radiation + some chemicals
Environmental factors which can increase the rate of mutation
The different forms which a gene may have. These are all the results of mutation from an original gene.
Differences between individuals in a population. The result of different alleles and different environment
Each generation produces far more offspring than can possibly survive to become adults.
The process by which nature makes sure that the survivors in each generation are the best adapted to their way of life and so pass on better characteristics. Also called "survival of the fittest."
Factors in the environment which make the survival of certain variations more likely than others
Having good ecological fitness, and therefore likely to survive
slow, gradual change in the genetic make-up of species as a result of natural selection over many generations.
Factor that causes genetic isolation of part of a population form the rest of the species
isolation barrier involving a physical structure e.g. river, mountain range
isolation barrier involving an environmental difference e.g. pH, salinity, different habitats
isolation barrier involving an animal's behaviour e.g. courtship
process which occurs after part of a population becomes separated by an isolation barrier, different mutations in the two populations and different selection pressures eventually gives rise to a new species
group of organisms with similar characteristics and can produce fertile offspring
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