HL 1 Biology

5.5b Classification

<<Animal Classification>> Animals/plants: male + female gametes fuse together and zygote is formed = develops into embryo Animals: the embryo develops into a solid ball of cells and then into a hollow ball of cells (blastula) mouth, gut and anus + body systems (nervous/blood/skeletal systems) may develop then divided into over 30 phyla based on … Continue reading

HL 1 Biology

5.5a Classification

<<Classification>> Binomial nomenclature: naming organisms first name is the genus; a group of species that share certain characteristics second name is the species/specific name  Rules: genus name begins with a CAPITAL letter and species name with a lower-case letter in typed/printed text binomial is in italics after binomial is used once in the text , it can be abbreviated … Continue reading

HL 1 Biology

5.4c Examples of Evolution

<<Evolution in Action- Galápagos finches>> Darwin observed 14 different species of finches noticed they vary in sizes, shapes of beaks (as well as diet) Darwin’s hypothesis: “one might really fancy that from an original paucity of birds in this archipelago, one species had been taken and modified for different ends.” Darwin’s finches – relationship between … Continue reading

HL 1 Biology

5.3 Populations

182-184 <Population Growth> S-shaped, growth curve: represents what happens when a population colonizes a new habitat as pop. density increases, various density-dependent factors begin to limit pop. growth *limiting factors: competition for resources, toxic by-products of metabolism, increase in predation, increase in disease Transition phase: natality slows in relation to morality max size of  population … Continue reading

HL 1 Biology

5.4b Natural Selection

• AA-CC: 197-9 <<Natural Selection>> Charles Darwin: developed theory of natural selection took voyage around the world on HMS Beagle The Origin of Species: book he wrote explaining theory + evidence of natural selection OBSERVATION -> DEDUCTION overpopulation -> struggle for some individuals to survive, some go extinct  Adaption (variation) -> better adapted wil tend to survive … Continue reading

HL 1 Biology

5.4a Evidence of Evolution

AA-CC: 193-6 <<Evolution>> Evolution: the cumulative change in the heritable characteristics of a population Charles Darwin: proposed theory of natural selection Main types of evidence for evolution: breeding domesticated animals/ crop plants fossils homologous structures geographical distribution of animals/plants <<Evidence for Evolution>> Domesticated Animals humans breed particular animal species = more variation artificial selection: selecting … Continue reading

HL 1 Biology

5.2b Greenhouse Effect

AA-CC: 188-92   ================DBQ========================== Uncertainty in temperature rise projections (p.190) 1) AIFI 2) The minimum is 1.1 degrees Celsius,  Maximum 5.9 degrees Celsius 3) 1.8 degrees Celsius ( 4 – 2.2 = 1.8) 4) Comparing the forecasts for arctic temperature with those for global average temperatures, the temperature in the Arctic is higher than the global … Continue reading