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What is variation?
Variation is the differences which can occur between individuals of the same species
What is a species?
A group of interbreeding organisms whose offspring are fertile
Why is variation important to a species?
Variation is important to a species as it allows the population to adapt to a changing environment so it has a better chance of survival
eg resistance and survival from a disease or colonising a new environment
Why is sexual reproduction important?
As it is an important source of genetic variation
In what three ways can variation arise?
Meiosis - gives rise to gametes which are not all the same
Fertilisation - nuclei of two gametes fuse to form a zygote with different combination of genes
Mutation - sometimes a change will occur in a gene and a new characteristic may be passed on
What is the chromosome compliment?
The characteristic number of chromosomes for every animal or plant
A diploid cell will have a _______ set of chromosomes?
A haploid cell will have a ______ set of chromosomes
Higher Biology - Unit Two - Variation revision