Selection

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  • Created by: J.E.C.
  • Created on: 17-04-14 16:06
Differences between the ___ ___ of inidividuals affects ___ ___ in populations?
Reproductive success, allele frequency.
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All organisms produce more offspring than can be supported by the supply of ___,___,___, despite overproduction of offspring most populations remain...?
food, light, space. relatively constant in size.
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This means there is ___ between members of a species? Some individuals will possess ___ _ ___ that make them better able to ___ in their competition with others?
combinations of alleles, survive
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Fitter individuals are more likely to obtain the ___ ___ and grow more rapidly and ...? As a result they will have a better chance of..?
available resources, live longer. Successfully breeding and producing more offspring.
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Only those individuals that successfully reproduce will...?
Pass on their alleles to the next generation.
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The alleles most likely to be passed on are those that...?
Alleles that gave the parents an advantage in the competition for survival.
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Over time the frequency of ___ in the population increases and that of the ___ ones decreases?
The advantageous alleles. non-advantageous
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Selection is the process by which...?
Organisms that are better adapted to their environment survive and breed, while those that are less well adapted fail to do so.
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What is directional selection and what does it change?
Selection that favours individuals that vary in one direction from the mean of the population. Changes the characteristics of the population.
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What is stabilising selection?
Selection that favours average individuals - preserves the characteristics of the population.
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If there is a change in environmental conditions, there is a change in the....?
Phenotype
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Directional selection results in...?
Phenotypes at one extreme of the population being selected for and those at the other extreme being selected against.
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If environmental conditions remain stable, the individuals with phenotypes ___ to the ___ are favoured?
closest, mean.
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Stabilising selection tends to eliminate...?
The phenotypes at the extremes.
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Other cards in this set

Card 2

Front

All organisms produce more offspring than can be supported by the supply of ___,___,___, despite overproduction of offspring most populations remain...?

Back

food, light, space. relatively constant in size.

Card 3

Front

This means there is ___ between members of a species? Some individuals will possess ___ _ ___ that make them better able to ___ in their competition with others?

Back

Preview of the front of card 3

Card 4

Front

Fitter individuals are more likely to obtain the ___ ___ and grow more rapidly and ...? As a result they will have a better chance of..?

Back

Preview of the front of card 4

Card 5

Front

Only those individuals that successfully reproduce will...?

Back

Preview of the front of card 5
View more cards

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