Summary

Summary Psychology: Biology and behavior

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Course
Introduction to developmental psychology

Institution
University Of Oslo

Book
How Children Develop

These are my notes from the third chapter in the 2020 book "How children develop". This chapter covers the main themes of The body: physical growth and development,brain development, behavior genetics and nature and nurture. PS: The purple boxes are the summaries of each subchapter/subject, and ...

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Summarized whole book? No
Which chapters are summarized? Chapter 3
Uploaded on September 13, 2021
Number of pages 7
Written in 2021/2022
Type Summary

psychology
nature nurture
genes
environmental forces
genotype
phenotype
behvior genetics
heritability
environmental effects
brain development
neurons
neuogenesis
differentiation
synaptogenesis
cortex

Book Title:How Children Develop

Author(s):Robert Siegler, Jenny Saffran

Edition:2017-03-01
ISBN:9781319107406
Edition:1

Class notes
textbook notes

Institution
University Of Oslo
Course
Introduction to developmental psychology

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“How Children Develop”
Sixth edition:2020: Robert S. Siegler; Jenny Saffran; Nancy Eisenberg; Elizabeth Gershoff
Chapter 3 – Biology and behavior
Nature and nurture
Summary:
 The starting point for development is the genotype - the genes inherited at
conceptions from the parents. Only some of the genes are expressed in the
phenotype, one observable characteristics. Whether some genes are expressed at
all is a function of dominance patterns. Most traits studied by developmental
scientists are influenced by multiple genes
 The eventual outcome of a given genotype is always contingent on the
environment in which it develops. Parents and their behavior toward their
children - which is influenced by the parents own genotypes - are a salient part if
the children's environment. Similarly, the child's development is influenced by the
aspects of environment he or she seeks out and the different responses the
child's characteristics and behavior evoke from other people
 Epigenetic effects - the switching on and off genes - underlies many aspects of
development and individual differences. This process is affected by experience via
methylation
History of gene science and understanding
 From long before the understanding of hereditary, people knew that traits "ran in
families"
o Selective breeding
 Gregor Mendel
o Pees - green and yellow
 1950s: James Watson, Francis Crick and Rosalind Franklin
o Structure of DNA
 Recent years
o Mapping of he entire genome
o Gene synthesis

Genetic and environmental forces
 Genotype: inherited genetic material
 Phenotype: observable characteristics and expression of the genome
 Environment: every aspect og individuals and their surroundings other than the
genes themselves

1. Parents´ genotype-child´s genotype
 Genetic material from parents to child
 Chromosomes consisting of two long strands of DNA
 Genes are segments of DNA that is a code for a protein
 Human hereditary
o 46 chromosomes - 23 pairs
o Genes of the same type on the locus on each chromosome pair
 Genetical diversity and individual differences
o Random assortment to assure variability

, o Crossing over: when gametes divide, two members of a pair of chromosomes
sometimes swap sections of DNA
o Mutation: some are random, other caused by environmental causes
 Can be passed onto an offspring
 Basis of evolution
 Sex determination
o Genetic females have two identical, large X chromosomes
o Genetic males have on X and one Y
o The genetic male partner always decides on the offspring's gender

2. Child´s genotype - child´s phenotype
 Endophenotypes: unobservable, intermediate aspect of the genome, our brain and
nervous system
 Some genes turn on, and some don´t
 Gene expression: Developmental changes
o The difference between the genotype and phenotype
o The switching on and off genes is controlled by regulator genes
o The activation of a turned off gene is a part of a chain of genetic events
o Genes never function in isolation
o A given gene can function multiple times in multiple places during
development
o External factors can also turn on and off gene
 Thalidomide on limb development
 Early visual experience is important for the visual system as it turns on
some genes, which in turn turns off other genes
o Gene expression: Dominance patterns
 Alleles in a gene influence the same trait of characteristics
 Dominant-recessive pattern: dominant and recessive genes
 Two of the same allele (homozygot)
 Two of the different alleles (heterozygot)
 Inheritance patterns are very complicated

3. The child´s environment - child´s phenotype
 PKU: a disorder related to a defective recessive gene of chromosome 12
 Abusive parenting and effects on the interaction with the child´s genotype to
produce different adult outcomes
o MAOA genes, an X-linked gene
 Parental contributions to the child´s environment
o Parents are central through their interactions with the offspring
o Parents behavior towards their children is genetically influenced
o This has been tested a lot

4. Child´s phenotype - Child´s environment
 Active child theme: children are a source of their own development
 Children experience different environments because of their behavior and
personality, despite living in the same house

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