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The Role of Sex This essay aims to determine what the biological role of sex is in the natural world. As a result it is sensible to first define "sex", "Sex n. either of two main groups (male and female) into which living things are placed according to their reproductive functions; fact of belonging to one of these; sexual feelings or impulses or intercourse." (Oxford English dictionary, 1981). This definition suggest that two main areas should be discussed when writing an essay on this subject; why has evolution largely favoured species being separated into males and females, and secondly, why has evolution favoured sexual reproduction over asexual reproduction? Asexual reproduction accounts for the exponential growth of a species or colony. This can be easily demonstrated by spreading a culture of Streptococcus Pneumoniae on an agar plate with minimum medium (MM) then counting the resulting colonies twenty-four hours later. Sexual reproduction on the other...

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