what is sexual reproduction ? explain how this mode of reproduction gives rise to more viable variation than asexual reproduction. how does this effect the evolution
Answers
Sexual reproduction gives rise to more viable variation than asexual reproduction. It is because there is an inbuilt tendency to variation during reproduction, both because of errors in DNA copying, and modes of sexual reproduction. The genes of the traits or characteristics are transmitted from one generation to the next generation and dominant characters are expressed. While in asexual reproduction, gene cannot be separated from the parent organism. The resulting variation in traits out of sexual reproduction not only help in survival of species but also support diversity in long run. Drift in genetic traits get accumulated spanning across generations, this gives rise to formation of new species
Sexual reproduction causes more viable variations due to the following reasons:
1)Error in the copying of DNA, which are not highly significant.
2) Random segregation of paternal and maternal chromosome at the time of gamete formation.
3)Exchange of genetic material between homologous chromosomes during the formation of gametes.
4) Accumulation of variations occurred due to sexual reproduction over generation after generation and selection by nature created wide diversity.
In the case of asexual reproduction, only the very small changes due to inaccuracies in DNA copying pass on the progeny. Thus, offsprings of asexual reproduction are more or less genetically similar to their parents. So, it can be concluded that evolution in sexually reproducing organisms proceeds at a faster pace than in asexually reproducing organisms.