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Sigmoid curve represents what happens when a population colonizes a new habitat With minimal competition, and environmental resistance the population will grow exponentially Birth rate is higher than death rate As the population increases there is more competition for resources, a build up of the toxic by products of metabolism, increase in predation, disease. The […]
May 13, 2013
1.) natural selection is dependent on variety and there is no variety in pure bred species 2.) The majority of flowering dates become later 3a) As the latitudes are lower the flowers grow later 3b) 4a) Reduction in
May 9, 2013
Domesticated Animals – Breeding of animals lead to artificial selection – Selection causes evolution – Ex: Pig and wild boar Fossils – Strong evidence that evolution has occurred convergent evolution – similarties in structure between organisms are superficial – for ex: whale and fish tails- analogus structures (when studied closely, different structures) – organisms have different […]
April 16, 2013
– Enhanced greenhouse effect caused by human edition so f greenhouse gases to the atmosphere (mostly fossil fuel burning) – Fluctuation in the carbon dioxide is caused by seasonal variations in the carbon dioxide uptake by land plants (during the winter, less carbon dioxide is absorbed by plants) – Methane and nitrogen oxides have been […]
April 14, 2013
1) Trees, plants 2) Equatorial forest 3) When trees are removed and crops are implanted, there are not enough nutrients in the soil left for crops to grow 4) Cell respiration 5) Nutrients are stuck under a layer of ice 6) After the layer of ice melts, cell respiration and the release of co2 is […]
April 11, 2013
The amount of energy converted to new biomass during a given time period by each trophic level in an ecological community can be represented in a pyramid. – The width of the bars is proportional to the energy in that trophic level – pyramids show how much energy is lost between trophic levels -5-20% of […]
April 10, 2013
Energy flow in food chains – Initial source of energy in most communities is light captured by plants going through photosynthesis – plants convert light into chemical energy – a portion of this energy is used in cellular respiration, released as waste heat into the environment – energy stored in plant tissues is passed to […]
April 8, 2013
Habitat- the environment in which a species normally lives or the location of a living organism Species- a group of organisms that can interbreed and produce fertile offspring Population- a group of organisms of the same species who live in the same area at the same time Community- a group of populations living and interacting […]
March 31, 2013
– In Vitro Fertilization is fertilization that happens outside the body in a laboratory GETTING THE GAMETES – Down regulation: Female takes a drug each day to stop her pituitary gland from releasing FSH or LH – Superovulation: Intra muscular injections of FSH and LH are given daily for about 10 days to stimulate many […]
March 22, 2013
– If TDF is present in the human embryo, its embryonic gonads develop into testes in the eighth week of pregnancy – It produces testosterone until the 15th week – Testosterone causes male genitalia to develop – At puberty, secretion (release) of testosterone increases – This causes secondary sexual characteristics, sex drive in men to […]
Alisa's Blog 
May 16, 2013
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