B. Cognitive psychology. True or false. According to Gilpin, there appears to be a true critical period influencing language and other cognitive developent in humans. Advice on childrearing provided by psychologists and other authorities has proved remarkably consistent over the years, despite widespread societal changes. Arnold Gesell was a theorist who attributed most important developmental phenomena to maturational processes, and who collected large sets of developmental norms of development.
Heterozygous twins resemble each other more in terms of intelligence than do fraternal twins.
Informed consent is both a legal requirement and also an ethical obligation incurred by researchers studying human development, even in young children. It has only been in the 20th Century that children came to represent an economic deficit rather than an asset. Most human behaviors appear to be under the control of single genes, though often multiple alleles may be involved. Nineteenth-century developmentalists were heavily influenced by the Theory of Evolution, and by empirical research on embryology. Recessive genetic traits are incorporated in the genotype, but are never expressed phenotypically.