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 region of study as new discoveries emerge. the hot 6th variation takes its position because the clearest, most recent evaluate of human and animal behavioral genetics to be had, introducing scholars to the field’s underlying ideas, defining experiments, fresh advances, and ongoing controversies.
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Extra resources for Behavioral Genetics
7e). Consider only the A and B loci for the moment. 7e, one gamete will carry the genes A, and B2, as in the mother, and one will carry A2 and Bh as in the father. The other two w ill carry A, with Bx and A2 with B2. For the latter two pairs, recombination has taken place— these combinations were not present on the parental chromosomes. The probability of recombination between two loci on the same chromosome is a function of the distance between them. 7, for example, the A and C loci have not recombined.
And there are 27 genotypes. Even if we assume that the alleles of the different genes equally affect the trait and that there is no environmental variation, there are still seven different phenotypes. So, even with just three genes and two alleles for each gene, the phenotypes begin to approach a normal distribution in the population. When we consider environmen tal sources of variability and the fact that the effects of alleles are not likely to be equal, it is easy to see that the effects of even a few genes will lead to a quantitative distribution.
The fundamental issue of heredity in the behavioral sciences is the extent to which differences in genotype ac count for differences in phenotype, observed differences among individuals. This chapter began with two very different examples of inherited disorders. How can Mendel’s law of segregation explain both examples? 4 shows how Mendel’s law explains the inheritance of Huntington disease. HD is caused by a dominant allele. Affected individuals have one dominant allele (H) and one recessive, normal allele (ti).