Your success at speed-dating might be influenced by your genetic make-up and your potential partner’s ability to detect so-called ‘good genes.’ The research team found that participants who were more likely to be asked on a second date had genotypes consistent with personal traits that people often desire in a romantic partner.
Coming off of a successful refutation of JayMan (check comments too), more evidence for our claim came out the other day. Us humans can match on genotype, which we, of course, match with people with other similar heritable characteristics. Since humans match on these traits that are more heritable than the ones that are more influenced by environment, then we can say that we are seeking out partners who are like us, therefore matching on genetic similarity.
Wu, et al (2016) examined 262 Asian Americans in a speed-dating setting. The researchers predicted that there would be considerable matching by genotype between the genders. They found that the gene A118G, which is linked to submissiveness and social sensitivity, whereas for the men, the minor variant with the -1438 A/G allele, which is linked to social dominance and leadership, were shown to have greater success. They also discovered that men and women with genotypes consistent with “prevailing gender norms were more likely to receive second date offers”
The researchers say that “These results suggest that personal attributes corresponding to A118G and −1438 A/G can be detected in brief social interactions, and that having a specific genetic variant or not plays a tangible role in dating success,” Those with the A118G polymorphism had greater capacity for experiencing social pleasure and pain as well as their need to have social contact. This also shows how Men and women with the opposite of each allele (men having the A118G allele and women having the -1438 A/G allele) were seen as less desirable mates, showing good evidence that each allele is gender-specific. Wu also believes this effect could also expand to other social interactions, such as job interviews.
This study shows more evidence for Rushton’s theory of spouses matching phenotypically by genotype. Spouses are as similar as 4th cousins. Spousal genetic similarity is a significant driving force for human civilization, as it selected for certain traits over others that then lead to things such as higher IQ in Eurasian men to beauty in Eurasian women, vice versa for Africans. In Eurasian societies, men hunted and while women took care of the children. Higher intelligence then evolved in men due to needing to strategize, among other things such as surviving the frigid temperatures. Women took care of the children, and thus developed a higher verbal IQ as a result of this. In Africa, women gathered food, selecting them for slightly higher intelligence than their male counterparts. Conversely, the African males were selected for attractiveness (Fuerle, 2008).
Those K-selected have lower birth rates, and thus, must be more rigorous in choosing a mate. Choosing a mate based on intelligence showed that the male could provide food as well as protect the family against predators and other bands of humans. R selected humans have more children and show less care, so they have higher birth rates to counter this. They are less rigorous in mate selection due to need to have more children due to a higher death rate. This is mirrored still, even today in modern society. Human sexual selection is one of the reasons why human evolution progressed to the point is has, with the driver being evolution in harsher climates. Eurasian women needed to be more stringent in choosing mates due to a higher chance of death in choosing the wrong mate. Over time, this lead to a ‘genotype sensor’ if you will, which by matching by certain phenotypic traits (facial symmetry, skin color, height, health, etc), chances for intelligent children, better care and more food will come as a result of this stringent selection by women, which in turn lead to evolution of certain traits in Eurasian men and women.
This shows that these human differences in how we select our spouses to how our civilizations ultimately end up is due to a) climate, b) sexual selection and c) genetics. Passing on the best genes lead to an ultimately better society, and as a result, this lead to those genes that were more successful having a chance to produce more copies of themselves, assuring that society would be run well in the future. This is also why government systems such as monarchies have hereditary rulers.
I have said numerous times that the tendency to favor co-ethnics is the tendency to favor shared genes. Benefiting those similar to yourself ensures that you’re benefiting copies of your genes, ensuring your genetic legacy for the future. Matching with those who appear similar to us by genotype when there is such phenotypic similarity shows that this is a trait we humans have to seek out those co-ethnics genetically similar to ourselves.