CAS PS 101 Study Guide - Final Guide: Chromosome, Menopause, Late-Onset Hypogonadism

• School: Boston University
• Department: Psychological & Brain Sciences
• Course: CAS PS 101
• Professor: Maya Rosen

Document Summary

Beginnings of life: sperm and ovum = gametes/germ cells, chromosomes long, parallel structures, 22 are autosomes and one is a sex chromosome, dna (deoxyribonucleic acid) building block of genes, genetic instruction in cells, twins, identical twins monozygotic/one egg twins, fraternal twins dizygotic/two egg twins. May include instructions for characteristics that are never manifested: phenotype: observable characteristics, heterozygous vs. homozygous, dominant vs. recessive, sex linked only carried on the x chromosome, human genome project, has identified all human genes about 30,000, functions are being identified. Embryonic stage 3rd week to 8th week: rapid growth and cell differentiation, cells begin to look like what they will be major organs, amniotic sac and umbilical cord develop, teratogens external things in the environment can affect baby"s health and development, radiation, toxic industrial chemicals, diseases, drugs (ie. alcohol, thalidomide, by the end of 8th week baby is now called a fetus and head can be seen.