PSYC 101 Lecture Notes - Lecture 7: Homo Sapiens, Peptide, Human Genome

• School: UBC
• Department: Psychology
• Course: PSYC 101
• Professor: Catherine( Cathy) Rankin

Document Summary

Walking on two feet, 4 million years ago. Huge increase in brain size over a small period of time. Increase in cortex, more folds in brain (more advanced) Modern humans emerged about 40000 years ago. Realize common genes for hair and skin between neanderthals and homo sapiens in some regions (colder, less sunny) Genetic bottlenecks- led to less overall variation than expected. Waves of homo sapien migration over a land bridge from asia to north america and south america. But now evidence that they may have come from other direction to-see through common genes. Sexual reproduction is a source of variation. Asexual reproduction- identical clones, ie if environment changes unfavourably-all could die out. Diploid- two copies of every gene (one mother and one father) Dominant allele has the most impact on the phenotype. Polygenic (more common)- many genes influence one trait. True breeding with homozygous (both alleles are the same) for brown trait.