Thus, specific mechanisms must exist to control centrosome inheritance in all sexually reproducing organisms.

In this way a process of evolution was started that led to the development of more and more complicated, self- reproducing organisms.

Background: The formation of crossovers during meiosis is pivotal for the redistribution of traits among the progeny of sexually reproducing organisms.

The idea is that in any population of self- reproducing organisms, there will be variations in the genetic material and upbringing that different individuals have.

Humans and most other sexually reproducing organisms are "diploid": they receive two copies of each gene, one from their mother and one from their father.