Why Do We Have More Boys Than Girls?
Why Biology Stack Exchange recommends it
Biology Stack Exchange users link it when asking or answering questions about male-biased birth sex ratios and environmental effects on offspring sex.
Recommended by 1 people across 1 different months, 2016 to 2017.
What it is
A 2.5 minute animated explainer from MinuteEarth on why about 106 boys are born for every 100 girls. It looks at how environmental conditions and parental circumstances can tilt offspring sex ratios in humans and other animals, with examples such as deer, lions and elephant seals.
What people said
Strong rec Polisetty · 2016-08 · Biology Stack Exchange · on “What's the determinant of the male-biased birth sex ratio in humans?”
[this video] This is a lovely video explaining it all. There are a ton of references down there in the description
Cites Probably · 2016-05 · Biology Stack Exchange · on “How do harsh conditions cause an increase in the male birth ratio?”
I've heard [this video] that in harsh conditions more human baby boys are born than girls because a bigger ratio of them will die before reproductive age. But in which aspects of the random gene combination while conception can harsh conditions (and which of their characteristics) actually can make a difference?
Cites Johnny · 2017-06 · Biology Stack Exchange · on “Is it possible to Breed an Animal to have more Females than Males?”
Minute Earth talked about environmental factors that cause animals and humans to have more male or female children: [this video] Presuming that is accurate, I was wondering if you could artificially select for people or animals who have more children of a certain gender? As far as I know, there are no animals that do produce notably more males than females, or vice versa, except maybe some insects.