Hence it is difficult to determine whether concordance in monozygous twins is due to shared genes or shared early environment.

Their faces betrayed the stamp of shared genes: generous mouths, widely set eyes of spice addict blue-on-blue.

None of them actually obey the formal theory which suggests that altruism towards kin in human societies is directly in proportion to shared genes.

And homosexuality is more concordant in identical than in fraternal twins, suggesting that their shared genes play a role.

Erm, and, that is, that is not a good deal as far as my shared genes are concerned.

He has also argued that the heritability estimate from a twin study may reflect factors other than shared genes.

Inclusive fitness is more generalized than strict kin selection, which requires that the shared genes are identical by descent.

This is not the grand and glittering Coney Island, but its much smaller cousin, distantly related through the shared gene that used to be called mirth.

Around 20% of this figure is accounted for by variation within each species, leaving only 1.06% consistent sequence divergence between humans and chimps at shared genes.

In my work on shared genes, I am developing this idea not just for Congress but all human beings.