schooling behavior of fishes. The objective was to investigate if fishes prefer to school with its own species. Briefly‚ a guppy was allowed to swim freely in a tank in which there were 2 beakers each containing three guppies (beaker 1) and three zebrafish (beaker 3). The times the guppy spent near beaker 1 and 3 were monitored. The null hypothesis is that fishes do not prefer to school with its own species. The results obtained show that the guppy spent 83.3% of the test period in the territory of beaker
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Microevolution and Macroevolution Microevolution is a inherited change in a population within the same species but this does not result in a new species. There are four factors that contribute to microevolution: mutation‚ gene flow‚ genetic drift‚ and natural selection. A mutation is generally a random change in the DNA. So for example‚ if a species of birds start developing shorter bills‚ then that is a genetic change. Gene flow is when a population migrates to a different area. The birds might
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He looked very precisely at the fossil records and noticed that some species changed physical features as time went by‚ eventually looking different from their ancestors. Many scientists had discussed evolution‚ but no one had a concrete theory such as Lamarck’s. He insisted that animals underwent physical changes in their
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1. Early on‚ Darwin states: “No one can say why the same peculiarity in different individuals of the same species‚ or in different species‚ is sometimes inherited and sometimes not; or why a child often reverts in certain characteristics to its grandfather or grandmother‚ or even to a more remote ancestor; or why a peculiarity is often transmitted from one sex to both sexes‚ or to one sex alone‚ more commonly but not exclusively (than) to a member of the same sex.” If you had the chance to explain
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`Biology B1 Revision Classification • Organisms were based into groups based on their characteristics (classification). • Kingdom‚ Phylum‚ Class‚ Order‚ Family‚ Genus‚ Species Kingdom Main Characteristics Animalia Multicellular; heterotrophic feeders so no chlorophyll‚ no cell walls; complex cell structure with nucleus Plantae Multicellular; autotrophic feeders using chlorophyll; cell walls made of cellulose; complex cell structure with nucleus Fungi Multicellular; cell walls not made
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underside‚ sharp beaks that replace teeth and allows them to tear their food. There are over 290 species of Testudines alive today
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general physical changes that occurred between several key species on the phylogeny of man‚ and a discussion of dating methods used to pinpoint the age of the fossils. This essay will begin with a brief discussion of dating techniques. In the study of hominid evolution‚ two main methods of dating are used: carbon-14 and potassium-argon dating. Carbon-14 dating involves the decay of radioactive C-14‚ which has a half life of 5770
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Darwin’s theory supports the idea that a species can evolve by passing on the best traits of the fittest individuals to the next generations. Lamarck’s theory suggests that each individual within a species has a tendency to make efforts to become better by acquiring particular characteristics and eventually passes them on to its offspring. Darwin’s theory states that if one individual has a useful trait they will be able to pass it on‚ thereby changing the species‚ whereas‚ Lamarck’s
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resembles a carpet with flowers of every hue from the color spectrum. There are more than 450 different species of flowers‚ orchids and carnivorous plants found in Kaas. Due to its beauty‚ every year
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The Tell-Tale Brain The book‚ The Tell-Tale brain explains how humans are unique in the world. This uniqueness stems from the brain we humans possess. The human brain has evolved according to 2 different methods. The first‚ most commonly known‚ is biological evolution. This type of evolution is slow and can take centuries for a single‚ subtle change to appear. While the second‚ is the cultural evolution. This type is fast compared to biological evolution. These two evolutionary processes gave birth
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