By John C. Loehlin

ISBN-10: 0716707535

ISBN-13: 9780716707530

From a Virginia property and a secure Bookcase! Copyright 1975, 1st Printing, W. H. Freeman and corporate, PO identify within entrance disguise, fresh and Tight. P17-7-2

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102-110). This means that on the average only one child in a hundred thousand or more will have a particular mutant gene that his parents did not carry. In a small primitive tribe having a breeding population of a few dozen pairs, a particular mutation might well never occur in a thousand generations. In a large modern population with an annual birthrate in the millions, it might occur several times in a given year. What then, are the odds that two modern races might differ in genes related to intellectual development sheerly by virtue of there having been chance mutational events in one Rice that did not occur in the other?

We will have more to say later in this chapter about the processes that might lead to gcne-frequcncy differences between popu­ lations, and more to say in the next couple of chapters on the question of how much influence genes have on intelligence. But first we wish to examine an attempt to infer the past history of races from current genetic differences among them. Estimating Racial History from Gene Frequencies Cavalli-Sforza and Bodmer (1971) use a model of evolution based on a uniform rate of genetic drift, a measure of genetic distance based on differences in gene frequencies, and the observed gene frequencies for 16 polymorphic blood-group systems, to estimate the times when the human population separated into the three major races.

Adams and Ward, 1973), although it is available from experimental studies of animal populations, especially Drosophila flies of several species. The above considerations are based on single genes. What about polygenic traits, as general intelligence is thought to be? Here one would expect any differences due to drift to be even smaller. The larger the number of loci involved, the less likely it is that chance factors would all happen to act in the same direction, and hence the less probable it is that a large genetic difference between populations could result from the operation of drift.

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Race Differences in Intelligence by John C. Loehlin

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