PSYC 3850 Chapter 4: Chapter 4

• School: University of Guelph
• Department: Psychology
• Course: PSYC 3850
• Professor: Carol Anne Hendry

Document Summary

The role of genes and chromosomes in heredity: chromosomes are made up of strands of dna, there are 22 pairs of autosomes and 1 pair of sex chromosomes, genes are located on the chromosomes and dictate inherited characteristics. Autosomal genetic disorders: disorders can be dominant (tuberous sclerosis, neurofibromatosis) or recessive (pku, Sex-linked genetic disorders: fragile x is the most common, genetically inherited form of cognitive/intellectual disability, other sex-linked disorders include lesch-nyhan and rett syndrome. Disorders related to the number of chromosomes: can result from nondisjunction, translocation, and mosaicism, most common is down syndrome. Disorders related to the structure of chromosomes: most common cause is a deletion of part of a chromosome, prader-willi syndrome is caused by a deletion of the long arm of chromosome 15. Disorders with multiple or unknown causes: conditions with multiple causes include hydrocephalus and microcephalus, sturge-weber is a disorder with an unknown cause.