D.2b: Allopatric Speciation

Evolution: Cumulative changes in the heritable characteristics of a population      – change in allele frequency over time – A change in the phenotypic frequency between generations does not necessarily indicate that evolution is occurring Species: a group of potentially interbreeding populations There are problems with the concept… – Some species reproduce asexually – […]

D.2a: Microevolution

Gene pool: All the genes in a population at a certain time Alleles: Variety of a gene Polymorphic: A gene is polymeric more than one allele is common in the population (The gene is polymorphic) DBQ 1) A large number of yellow snails were eaten at the beginning of the experiment. However throughout the experiment […]

D.1c Origin of Life: Endosymbiosis

1.) One obtains knowledge, a set of truths substantiated with evidence. Belief, is one’s perspective, view or thoughts towards a subject. 2.) Although Margulis has a clear view and facts of the endosymbiosis theory, she does not provide us with evidence in her statement. Without any experiment or testing, her belief is merely a conjecture, […]

D.1a: Origin of Life: Organic molecules

All cells come from pre-existing cells, thus we must find the first cells to have ever existed Cells were the first living thing on Earth For cells to arise from non-living material four requirements had to be met: – Simple ORGANIC MATERIALS   – Simple materials must be assembled into POLYMERS – the abiotic produced […]

D.1b: Origin of Life: RNA World

The packaging of abiotically produced molecules into structures with different internal chemistry from its surroundings was a necessary stage in the origin of cells. – Structures are called PROBIONTS (response to environment and metabolism) The origin of cells requires inheritance – In modern biological systems: replication and catalysis need enzymes – To there be enzymes, […]

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