Question

explain the molecular theory of recombination

Answer 1

Genetic recombination is the production of offspring with combinations of traits that differ from those found in either parent

Answer 2

In molecular biology, recombination generally refers to the molecular process by which genetic variation found associated at two different places in a continuous piece of DNA becomes disassociated.
Simply, Recombination is the production of new DNA molecule(s) from two parental DNA molecules or different segments of the same DNA molecule. The genetic recombination causes re-arrangement of genes producing altogether new genotypes and phenotypes. These cause variations which lead to evolution.
In this process one or both of the genetic variants are replaced by different variants found at the same two places in a second DNA molecule.
One mechanism leading to such molecular recombination is chromosomal crossing over.
At least four types of naturally occurring recombination have been identified in living organisms.
They are:-
1) General or homologous recombination
2)Illegitimate or non homologous recombination
3) Site specific recombination
4)Replicative recombination.