What are variations ? How do they develop? Give their significance.
Variation is defined as any change in the genome of an organism that can produce an altered phenotype.
There are various sources of variation such as mutation, events occurring during sexual reproduction; crossing over , independent assortment, errors in replication, etc.
Significance of variation
Chances of survival of a population increase in the condition when there are more positive variations (favourable variations) in comparison to negative variations (unfavourable variations).
Sexual reproduction is better at producing variations than asexual reproduction. Thus, species which reproduces sexually has a better chance of surviving than asexually reproducing species
Effect of variation become visible when there is a change in the environment. Organisms having variations that could help them to get adjust in the changed conditions, are selected by nature and allowed to continue their generation and rest are rejected.
There are various sources of variation such as mutation, events occurring during sexual reproduction; crossing over , independent assortment, errors in replication, etc.
Significance of variation
Chances of survival of a population increase in the condition when there are more positive variations (favourable variations) in comparison to negative variations (unfavourable variations).
Sexual reproduction is better at producing variations than asexual reproduction. Thus, species which reproduces sexually has a better chance of surviving than asexually reproducing species
Effect of variation become visible when there is a change in the environment. Organisms having variations that could help them to get adjust in the changed conditions, are selected by nature and allowed to continue their generation and rest are rejected.