PSYC 2450 Lecture 3: Lecture 3 - Notes.docx
25 Jun 2014
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Document Summary
Genotype: refers to genetic makeup of organism; is the inherited set of genes. Phenotype: physical expression of a genotype; can be the result of the interaction between genes and the environment. Dna denotes a gene the zygote rapidly divides exponentially at that. Monozygotic twins are identical twins; conception results in one zygote which then spontaneously splits into 2 cells that are genetically identical there is a 1 in 250 chance of having identical twins. Dizygotic twins are fraternal twins; conception results in two zygotes (two eggs fertilized by 2 sperm) Male or female? there is a 1 in 125 chance of having fraternal twins. Sex of human is determined by father. The 23rd pair of chromosomes are the sex-chromosomes. Males are made up of an x and y chromosome sperm will give an x or. Females are made up of two x chromosomes eggs can only give an x: genes and gene expression.
