BIOL 1202 Chapter : Biology 1202
Document Summary
Homo sapiens (italicized or underlined and capitalized h) Family tree of life- everything on the planet is related to every other thing. Mutant- different dna sequence (humans are mutants to one another) Most species on the planet reproduce asexually, therefore you cannot use a species definition: use dna sequencing to find out if they are the same species. 2 things that determine phenotype: genotype, environment. Based on their phenotype we predict where their ancestors came from. Mother nature used to force people to be less different, but due to travel people have moved around and began breeding more different species gene flow. Homo sapiens= same species= all share a common ancestor: earth is 4. 6 billion years old, homo sapiens have been on the earth 200,000 years. Skull timeline (7 million years: other species co-existed with homo sapiens, homo sapiens evolved out of africa, our bodies are made up of 50 trillion cells.
