do older parents have more daughters

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鏄?/div>鏍规嵁 4 涓潵婧?/li>

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  • Why do some parents have more daughters than sons?

  • Parents may be evolutionarily designed to have more daughters when they are older, so that, when they die, they are less likely to leave sons who have not sexually matured. Being orphaned young is bad both for boys and girls, but it鈥檚 much worse for boys than for girls.

  • What percentage of parents over 40 have a son?

  • Teenage parents are particularly likely to have sons, with the proportion of sons at .5327, and older parents over the age of 40 are significantly less likely to have sons, with the proportion of sons at .3557. Two-thirds of children born to parents over 40 are girls!

  • What causes a man to have more children than a woman?

  • The third combination, known as ff, [causes men to] produce more X sperm and have more daughters.鈥?According to Dr. Langdon, 鈥淭he gene that is passed on from both parents, which causes some men to have more sons and some to have more daughters, may explain why we see the number of men and women roughly balanced in a population.鈥?/div>Why Do I Keep Having Girls (Or Boys)? Genetics Behind

  • Are older women more likely to marry younger men?

  • Given the prevalence of age homogamy, where the age of the mother and the age of the father are generally positively correlated such that younger women are typically married to younger men and older women are typically married to older men, the slight sex difference in the pattern is not important.

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