PSYCH 1XX3 Lecture Notes - Lecture 5: Egg Cell, Twin, Chromosome
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• Monozygotic Twins- Genetically identical because they come from
the same sperm and ovum
• Dizygotic Twins- Share 50% of genes (like normal sibling)
because different sperm and ovum.
• Male determines the sex of the child, the 23 pain of chromosome
determines the sex of the baby.
• Polygenetic Inheritance- When multiple genes are involved in the
expression of a trait. Many traits like height and weight, are
determined by the interactions of multiple genes.
• Codominance – Already know
• Simple Dominant-recessive inheritance- Already know
• Sex-linked inheritance- Already know
Nurture vs Nature
• Canalization Plan- Genotype restricts the phenotype to a small
number of possible developmental outcomes. Some developmental
processes are buffered against environmental variability. (IE- all
infants babble all the same regardless of background meaning they
are independent of the environment, however, later culture begins
to shape the child differently)
• Range-of-Reaction Principle- Genotype establish a range of
possible responses to different kinds of life experiences.
Three ways Genes can influence the type of environment you
• Passive Genotype/Environment Correlations- The environment
that the parents choose to raise their child in was influenced by the
parents’ own genes, so the environment chosen by the parents is
likely to mesh well with the inherited genetic potential of the child.
(IE- athletic parents might seek an active playroom for their child
to grow up in)
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