Behavioral Genetics by Robert Plomin

By Robert Plomin

For over 4 many years, Behavioral Genetics has explored the crossroads the place psychology and genetics meet, advancing step-by-step with this dynamic zone of study as new discoveries emerge. the hot 6th variation takes its position because the clearest, latest evaluate of human and animal behavioral genetics to be had, introducing scholars to the field’s underlying rules, defining experiments, fresh advances, and ongoing controversies.

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The disorder appears only when a threshold of liability is exceeded. Sum m ary M endel’s laws of heredity do not explain all genetic phenomena. For example, genes on the X chromosome, such as the gene for color blindness, require an extension of M endel’s laws. Other exceptions to M endel’s laws include new mutations, changes in chromosomes such as the chromosomal nondisjunction that causes Down syndrome, expanded DNA triplet repeat sequences responsible for Huntington disease and frag­ ile X mental retardation, and genomic imprinting.

In fact, Galton developed the funda­ mental statistics of regression and correlation mentioned above in order to describe the quantitative relationship between pea seed size in parents and offspring. 8). 33. This means that, for the entire population, as parental size increases by one unit, the average offspring size increases one-third of one unit. Galton also demonstrated that human height shows the same pattern of inheri­ tance. Children’s height correlates with the average height of their parents.

15. 7 Resemblance for general cognitive ability increases with genetic relatedness. 30. 45; this correlation is similar to that between parents and offspring. 85. 40, a result that has implications for interpreting sibling and twin correla­ tions, as discussed in Chapter 12. How do Mendel’s laws of heredity apply to continuous dimensions such as gen­ eral cognitive ability? Pea Size Although pea plants might not seem relevant to schizophrenia or cognitive ability, they provide a good example of complex traits.

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