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Developmental Psychology

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Submitted By ashleym
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Biological & Environmental
Foundations
Chapter 2
Developmental Psychology

Genotype vs. Phenotype
Genotypes:
- Genetic makeup of the individual

Phenotypes:
- Directly observable characteristics Genetic Foundations
Some definitions…
 Genes: Basic unit of genetic information
 Chromosomes: rod-like portions of DNA which store/transmit genetic information




46 chromosomes in each cell (23 pairs)

DNA: deoxyribonucleic acid; chemical substance that makes up genes, chromosomes Mitosis
DNA duplicates itself through mitosis
 Permits a one-celled fertilized ovum to develop into a human being


Sex Cells







Gametes: sex cells (sperm, ovum); each have 23 chromosomes; combine to create a zygote
Zygote: sperm and ovum unite (conception); have 46 chromosomes
Meiosis: Cell division process through which gametes are formed; Halves number of chromosomes in body cells (46)
Autosomes: 22 matching pairs of chromosomes that are NOT sex chromosomes
Sex Chromosomes: The 23rd pair of chromosomes
(XX=female; XY=male)

Twins


Fraternal (dizygotic) twins







Most common multiple birth
Caused by release/fertilization of 2 ova
As genetically similar as any two siblings
Older maternal age, fertility drugs, in vitro all contribute to more fraternal twins

Identical (monozygotic) twins




Zygote that has begun to duplicate separates into 2 clusters of cells
Same genetic makeup
1 out of every 285 births

Genetic Inheritance


Alleles





Two forms of the same gene
One inherited from each parent
Homozygous – the two alleles are alike
Heterozygous – the alleles differ

Dominant-Recessive Inheritance
One allele affects the child’s characteristics
(dominant); the other allele has no effect
(recessive)
 Ex: Phenylketonuria
(PKU)


Genetic Inheritance

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