State the two important factors which can cause variation and how?
Answers
Genetic recombination and mutation in sexual reproduction are the two main causes of variation.
Any difference between cells, individuals, or populations of organisms of any species that result from genetic differences or the impact of environmental conditions on the manifestation of genetic potentials is referred to as variation.
The driving force behind evolution is biological variation, which is crucial for individual survival as well as the survival of species. Over many millions of years, the variation evolved to increase a person's probability of survival.
By recombination of genes, sexual reproduction encourages genetic diversity. As alleles in gametes are randomly divided and reassembled after fertilization, genetic variety results.
In meiosis, the crossing over of gene segments in homologous chromosomes also results in creating unique gene combinations.
A DNA sequence mutation is an alteration. These differences in gene sequences can occasionally be beneficial to an organism. The majority of genetic mutations produce features that are neither advantageous nor disadvantageous.
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