https://scalar.library.yorku.ca/iq-testing-/index
The concept of people being born unequally goes against the western ideals of equality of human being. Given the history based on the notions of fake science and discrimination against under privileged communities, the subject directly feeds into the political landscape and the tensions between the right wing and the left wing.i
Scientifically speaking, however, IQ is an inherited trait to some extent. Researchers have concluded that adopted children have their IQ more correlated with their biological parents than the adoptive parents. Not only that, as adopted children grow older, the correlation of IQ with the IQ of biological parents becomes even more stronger.h
This is counter intuitive. Robert Plomin, the lead researcher of this study explains: " People assume that genes impact is by the time of birth. After that nature takes over nurture, hence the impact of genetics becomes less important. This is basically exactly opposite to what the study says."T
he outcome of this study is been vetted by hundred of other similar studies who claim that about half of difference in IQ is genetic
The conclusive studies to connect IQ with genetics have proven quite difficult. However, with the availability of more compute and scope of broader studies have led researchers to identify some genetic connections with IQ. Problem is that IQ is derived from roughly 500 different genes, so each identified gene has a miniscule impact on overall IQ. That being said, while researchers were able to identify only 1% of variance in IQ a few years ago, today the number stands at 10%.
just to be clear, genes aren't destiny. Genes provide us the limits. Environment defines where we will end up between these limits. One less controversial example is height. Although, genes define the height, lack of nutrition can results in less heights for the population with similar genes. It has been thoroughly observed that as the economy of a country grow, so does the height of its population. Similarly, while IQ is a genetic trait, lack of Iodine on food results in lower IQ of children Many developing countries have resolved this problem whilev promoting Iodized salt among their population. Similarly, Treating parasitic worms and reducing lead from petroleum has also helped countries increase the IQ.
and another similar article: https://www.testkidsiq.com/scientific-racism/