Trivers-Willard

Category archives for Trivers-Willard

Whitey Bulger has finally been convicted of a small percentage of all the bad things he is said to have done. The Boston Globe has the details. James J. “Whitey” Bulger, the notorious Boston gangster who rampaged through the city’s underworld for decades before slipping away from authorities and eluding a worldwide manhunt for more…

Time Trauma Truth and Other Matters

First of all, I want you to know that I’ve devoted my life to this blog post so now you have every reason to love it more than any other blog post. Sniff sniff.

Tiger Woods has gone too far.

I did not get on the Tiger Hating bandwagon when it was revealed that he had a wife and 19 girlfriends. First, I’m sure they were all having a great time at some point. Second, I can see where his wife would be pissed off but she did marry a golfer after all. What else…

Is the Natural World a valid source of guidance for our behavior, morals, ethics, and other more mundane areas of thought such as how to build an airplane and what to eat for breakfast?1 When it comes to airplanes, you’d better be a servant to the rules of nature (such as gravity) or the airplane…

Stealing Genes and Hypergyny

This post was originally titled “Mail Order Brides and Hypergyny.” I was prompted to revisit the post because it received a a rather astonishing comment that I chose not to allow, but I did post it on my Facebook page where any attention it would receive would be from the thoughtful people that make up…

Finches Determine Sex of Offspring

As you know if you read my blog, Trivers Willard is an important theoretical construct which has been tested numerous times. TW works in some species, not in others, and overall, that should be predictable (accroding to TW). It turns out that finches control the sex of their offspring, and do so in a way…

Macaque Mothers Favor Their Sons

The Trivers Willard Hypothesis predicts that under certain conditions, individuals will bias their investment in offspring differently depending on the sex of the offspring. It is believed that this can be as extreme as infanticide or as subtle as providing different amounts of breast milk. A new study by Katherine Hinde finds that macaques may…

Human societies tend to be at least a little polygynous. This finding, recently reported in PLoS genetics, does not surprise us but is nonetheless important. This important in two ways: 1) This study uncovers numerical details of human genetic variation that are necessary to understand change across populations and over time; and 2) the variation…

Sex Ratio Bias in India

Sometimes boys are worth more, sometimes girls are worth more. In an evolutionary sense. Or, more correctly, the value of a certain sex … as an offspring … can be measured in fitness terms. Fisher noted this and hypothesized this was the explanation for the 50-50 sex ratio we usually see. As one sex becomes…

Why is there no Birth Control Pill for men? This latest “Ask a ScienceBlogger” question will certainly engender a wide range of responses from the Scienceblogs.com team. Answers may address physiology, endocrinology, pharmacology, economics, and other areas of scientific thinking and practice. The answer I’d like to propose can be summed up in two closely…