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In these species (e.g., bacteria, ciliates, dinoflagellates and diatoms), "sex" and reproduction occurs separately.The concept of sex includes two fundamental phenomena: the sexual process (fusion of genetic information of two individuals) and sexual differentiation (separation of this information into two parts).On the other hand, Charles Darwin (1809-1882) concluded that the effects of hybrid vigor (complementation) "is amply sufficient to account for the ... This is consistent with the repair and complementation hypothesis, described below. Assume the entire population of some theoretical species has 100 total organisms consisting of two sexes (i.e.males and females) with male-to-female representation, and only the females of this species can bear offspring.The issue features in the writings of Aristotle, and modern philosophical-scientific thinking on the problem dates from at least Erasmus Darwin (1731-1802) in the 18th century. Williams, Harris Bernstein, Carol Bernstein, Michael M. This section will briefly focus on the ostensible disadvantages of sexual reproduction as compared to relative advantages in asexual reproduction.August Weismann picked up the thread in 1889, arguing that sex served to generate genetic variation, as detailed in the majority of the explanations below. Given that sexual reproduction abounds in multicellular organisms, this section is followed by a lengthy overview of theories aiming to elucidate the advantages of sex and sexual reproduction.

Contrast this outcome with an asexual species, where each member of the 100-organism population is capable of bearing young.This is a consequence of the fact that gametes from sexually reproducing species are haploid.Again however, this is not applicable to all sexual organisms.If all capable members of this asexual population procreated once, a total of 100 offspring would be produced.This implies that an asexual population can grow much more rapidly with each generation. If each individual were to contribute to the same number of offspring (two), (a) the sexual population remains the same size each generation, where the (b) asexual population doubles in size each generation.

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