How many women to men ratio?

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  • 6 months ago

    It depends on the age group. Males are slightly more numerous at birth than females, but females outnumber males past 70. These trends are rather universal, and there are several explanations for them. For example, the first son of a couple tends to be male, the second female. That's because men are more sexually active in their 20s, while women become more interested in sex in their mid-30s. Sperm cells carrying an Y chromosome (that will produce a male foetus) are slightly less heavy than those carrying an X chromosome (that will produce a female foetus), but they also have a shorter lifespan. This means that if an egg hasn't been released yet (which occurs toward the second week after a woman's period started) there'll be an enrichment of X-carrying sperm cells if the couple has sex. On the contrary, if the egg has been released and is already in the fallopian tubes, Y-carrying sperm cells will be the first ones to reach it.

    Regarding people aged >70, there are several reasons that explain why men are relatively rare among this group. Men are more risk-taking than women, and also heavier drinkers and smokers. Men are more prone to be afflicted by sex-linked disorders (including hemophilia and color blindness), because they're haploid for most genes located on the X chromosome.

    There are other, mainly historical, causes that may alter the male to female ratio, including wars (men are the ones that get killed most of the time) or infanticide (men are more desirable than women in some societies).

    U.S. population pyramid (2015):

    https://www.census.gov/content/dam/Census/newsroom...

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  • Anonymous
    6 months ago

    For most sexually reproducing species of animals, the ratio is close to 50-50 because it is what we observe in nature, and it is known as Fisher's principle, because geneticist Ronald Fisher figured out in his 1930 book why there is no advantage to have more individuals of one gender than the other gender.

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  • 6 months ago
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  • Anonymous
    6 months ago

    The sex ratio for the entire world population is 101 males to 100 females (2018 est.). Depending upon which definition is used, between 0.1% and 1.7% of live births are intersex.

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  • sepia
    Lv 7
    6 months ago

    Women to Men ratio:

    Like most sexual species, the sex ratio in humans is approximately 1 : 1.

    In humans, the natural ratio between males and females at birth

    is slightly biased towards the male sex,

    being estimated to be about 1.05 or 1.06 males/per female born.

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  • Anonymous
    6 months ago

    Depends where you are.

    In Alaska, the ratio of women/men is very low. But as the women say "while the odds are good, the goods are odd"

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  • 6 months ago

    How many women are there?

    How many men are there?

    The ratio would then be W:M, but you might be able to reduce it to lower terms.

    For example, if there were 45 women and 30 men, the ratio would be 45:30 but it could be reduced to 3:2 by dividing both by a common factor of 15.

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