ED PSYCH 320 Lecture Notes - Lecture 1: Sickle Cell Trait, In Vitro Fertilisation, Down Syndrome
1 Feb 2017
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Document Summary
Complex blend of genetic information that influences characteristics. 1 zygote separates into two clusters of cells. Two copies of every gene are inherited one from each parent. Not always detected early varies in expression. Phenylketonuria (pku) is a common recessive disorder. Crescent, or sickle shaped red blood cells. Block blood flow pain, swelling, tissue damage. Carriers may experience symptoms with oxygen deprivation. Both alleles are expressed in phenotype combined trait. Male sex chromosomes (x, y) may explain higher rates of: Usually result in miscarriage or early death. 95% have extra chromosome trisomy 21. Usually have extra chromosome (x or y), or missing x (in females) Turner syndrome (~ 1 in 2,000 females) Triple x syndrome (~ 1 in 1,000 females) Chemical marker that activates either the mother"s or father"s allele. Can be spontaneous or caused by hazardous situations. Can be harmful, but does increase genetic variation. Germline: mutation in cells that create gametes (sperm & ova)
