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autosomes
first 22 pairs of chromosomes
sex chromosomes
23rd pair that determines the gender of the child
genes
a section of dna which code for particular traits
allele
one contribution in the gene pair coding for a specific trait
phenotype
genetic instructions combined with environmental influences, physical representaion
Behavioral genetics
the study of the influences of behavioral and psychological traits
Polygenetic inheritance
When many genes affect the phenotype of a trait
Reaction range
The range of phenotypic expression depending on different environments of different qualitys
Zygote
weeks 1-2
Embryo
weeks 3-8
fetus
week 9 - birth
teratogen
an agent that causes abnromal prenatal develpoment