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GCSE Eduqas Variation and evolutionVariation within species caused by genetic mutation can be inherited. This allows some members of a species to be better adapted to an environment and so evolution can then occur by natural selection. Part of Biology (Single Science) Inheritance, variation and evolution
quiz Test
Advantages and disadvantages of sexual and asexual reproductionVariation refers to the differences between members of the same species. Having variation within a species means that if the environment changes there may be individuals within the species more able to withstand the change and survive. There is usually extensive genetic variation within a population of organisms or a species. The advantages of sexual reproduction:
Humans can speed up natural selection through selective breeding, which can increase food production. The advantages of asexual reproduction:
The disadvantages of sexual reproduction:
the disadvantages of asexual reproduction:
GCSE Subjects
Why do some population growth what factors help to determine the rate of this growth?Populations gain individuals through births and immigration. They lose individuals through deaths and emigration. These factors together determine how fast a population grows.
How are other organisms affected as the human population grows and more natural resources are used?Additionally, as populations increase, more land is used for agricultural activities to grow crops and support livestock. This, in turn, can decrease species populations, geographic ranges, biodiversity, and alter interactions among organisms.
What will happen to the population size when Natality exceeds the mortality?Growth through natural increase occurs when the birth rate exceeds the death rate.
How are biotic potential and carrying capacity related to population growth?Biotic potential refers to the inherent power of a population to increase in numbers when all. environmental conditions are favourable, whereas carrying capacity refers to the maximum population size that a given environment can support for an indefinite period or on a sustainable basis.
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All successful organisms overproduce. what advantage does this provide for the species
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