CAS WS 101 Lecture Notes - Lecture 1: Internment Of Japanese Americans, Genetic Drift, Phenotype

• School: Boston University
• Department: Women's, Gender, & Sexuality Studies
• Course: CAS WS 101
• Professor: Karen Warkentin

Document Summary

In humans: males and females are necessary for (sexual) reproduction. Evolution is the process of heritable change in a population across generations. Most biological evolution is due to changes in dna sequences: other mechanisms: cultural inheritance, it is not an individual development process. Ns causes adaptation (the t of organisms to environment: phenotype = all expressed characteristics of an organism, above level of dna sequence, two basic approaches: Historical: understand the past from evidence that remains eg: compare fossils. Mechanistic: understand how evolution can happen eg: experiments. Two billion years ago: large complex eukaryotic cells. Friday, september 8, 2017: meiosis makes new genetic combinations. Independent assortment: maternal and paternal chromosomes mix and separate randomly. Haploid cells from diploid cells: syngamy. Haploid genomes (nuclei or whole cells) combine to form new diploids. Most reproduction is asexual: cloning; eg: bdelloid rotifers: all females species reproduce asexually without males. Sex was optional: more like a response to stress.