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Sex ratio

Definition

noun

The proportion of males to females in a species or in a population.


Supplement

Primary sex ratio refers to the ratio at conception. Secondary sex ratio refers to the ratio at birth. Tertiary sex ratio refers to the ratio at maturity.


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Re: Brain size=IQ level theory (Blacks vs Whites & Asians)

... for human intelligence to correlate well with brain size, or with the ratio of brain mass to body mass. We can more-or-less see that in human evolution, ... factors which may be accompanied by variations in brain weight, viz. sex, body size, age of death, nutritional state in early life, source ...

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by Seth90210
Sat Oct 26, 2013 7:38 am
 
Forum: Human Biology
Topic: Brain size=IQ level theory (Blacks vs Whites & Asians)
Replies: 72
Views: 263450

unbalanced gender ratios of offspring

If I want my chromosomes to get intermixed, I'll want offspring of the sex of which there are fewer. Suppose there is currently one female and ninety-nine ... different chromosomes from someone else. I personally think that the ratio is perhaps due to the preservation of genetic diversity. Most mammals ...

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by wildfunguy
Sat Sep 07, 2013 10:47 pm
 
Forum: Human Biology
Topic: unbalanced gender ratios of offspring
Replies: 6
Views: 4330

unbalanced gender ratios of offspring

All in all, it seems paradoxical that (in most mammals) the sex ratio is close to 50:50, since only a fraction of the males would suffice to impregnate all the ...

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by biohazard
Tue Jun 18, 2013 11:51 am
 
Forum: Human Biology
Topic: unbalanced gender ratios of offspring
Replies: 6
Views: 4330

unbalanced gender ratios of offspring

hi, i've read that the natural sex ratio at birth is 105 boys to 100 girls. this is counter-intuitive since, assuming no other factors are ...

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by TYLS
Thu Jun 13, 2013 11:11 am
 
Forum: Human Biology
Topic: unbalanced gender ratios of offspring
Replies: 6
Views: 4330

Evolution and environment question--breathing, etc

A thousand years (~50 generations) is not much time for significant genetic adaptation to take place. For example, ... culture changed extremely fast, but I think the major genetic change (different sex ratio) was actually due to making a mistake during the genetic engineering.

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by AstraSequi
Tue May 29, 2012 4:32 am
 
Forum: Evolution
Topic: Evolution and environment question--breathing, etc
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Views: 3552
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