what are the causes of variations in living organisms
Answers
Answer:
Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).
Causes of variation
Genetic
Genetic variation exists because of changes to chromosomes or genes (DNA).
Mutations are random changes in the number of chromosomes (e.g. Down syndrome) or the structure of a gene (e.g. cystic fibrosis).
Independent assortment during meiosis increases variation because it results in genetically different gametes.
The random nature of sexual reproduction also gives rise to variation.
Environmental variation
An individual’s environment can also cause variation.
For example, human height is genetically controlled but actual height reached will depend on the nutrition available.
Explanation:
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Answer:
Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).
Explanation: