EDPS 260 Chapter Notes - Chapter Chapter 2: Quantitative Trait Locus, Genomic Imprinting, Intellectual Disability
27 Oct 2016
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Document Summary
Each individuals phenotype (characteristics) is a product of both genotype and environment. Chromosomes contain our heredity, along the lengths are genes (dna) Regulatory genes modify the making of proteins. Gametes (sex cells) are produced through meiosis (half the chromosome #) X chromosome is a girl, y chromosome is a boy. Fraternal or dizygotic twins result when two ova are released from ovaries. Identical or monozygotic twins develop when a zygote divides in two during the early stages of cell duplication. Traits controlled by single genes follow dominant recessive and incomplete dominance patterns of inheritance. Heterozygous with one dominant and one recessive are carriers of the recessive trait. Incomplete dominance both alleles are expressed in the phenotype. X linked inheritance applies when recessive disorders are carried on the x chromosome and effect males. Genomic imprinting one parents allele is activated that affects brain development and health.
