[BIO-0014] - Midterm Exam Guide - Everything you need to know! (28 pages long)
7 Feb 2017
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Key mechanism of evolution: change in heritable traits of a population over time, e. g. If no immigration or emigration is occurring: births - deaths. Change population: density dependent factors, predation, food, water, space, genetic change, populations cannot grow infinitely means that there will be competition for resources. Individuals with certain traits may have an advantage. Those individuals have have enhanced survival, thus more offspring. As population reaches k, increased competition for food means that birds with traits for big beaks have increased survival: genetic variation, why has sex evolved, many species are capable of asexual reproduction, strawberries, some flowers, some bugs. Each daughter cell has one set of chromosomes. Process of gametogenesis: meiosis 2, results in 4 haploid cells. Each two daughter cells from meiosis 1 divides: a gene is a section of dna that influences one or more hereditary traits, diploid. Ploidy: many organisms including humans are diploid, two homologous chromosomes, diploid (2n) cells have.
