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The ratio is the ratio of males to females in a population. In most sexually reproducing species, the ratio tends to be 1:1. This tendency is explained by Fisher's principle. For various reasons, however, many species deviate from anything like an even ratio, either periodically or permanently.
In the human species the ratio between males and females at birth is slightly biased towards the male person. The natural “ ratio at birth” is often considered to be around 105. This means that at birth on average, there are 105 males for every 100 females.
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