noting a quantitative relationship between social group size and some measure of brain size (Dunbar et al.‚ 2009). In a similar vein‚ Geoffrey Miller (1998)’s sexual selection hypothesis posits that hominid cognitive development came about through sexual selection‚ with cognitive displays acting as fitness indicators for potential mates. However‚ a common issue with these hypotheses is explaining the phylogenetic distribution
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fundamental connections between the evolutionary process and behaviour‚ in particular that of altruism and whether it can be seen as an adaptive behaviour are considered here. Evolution occurs due to two main processes: genetic variation and selection. A human being’s genetic make-up is created from 46 randomly selected chromosomes. The chromosomes are transmitted in equal measure from each parent. From this “mixing” (Clegg‚ 2007‚ p.117)‚ these chromosomes will create the cells that become
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Gradual variation across space Island organisms resemble those of the nearest continent Who directly influenced Darwin? Thomas Malthus provides Darwin with “competition for survival How do artificial and natural selection work? Artificial selection
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an attribute which fits well with its habitat thus providing it with an advantage over others of its kind. This advantage in turn makes the creature hardier than its compatriots leading to increased chances for survival and‚ perhaps‚ better selection of mates. This uniquely equipped animal then breeds and its new trait is passed on to some of its progeny who in turn breed‚ pass it on‚ and so forth until those with this new trait outnumber and ultimately outlast those who lack the evolutionary advantage
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The evolutionary approach suggests that our behaviour is determined through natural selection; therefore it is coded into our genes through how we have adapted. It is a biological approach and states nature over nurture. A criticism of this approach is that it is determinist as it suggests that the way we behave is dictated through natural selection‚ for example in gender roles men being strong hunters and wanting a younger female partner. It ignores other suggestions‚ such as how we are brought
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Elephants Growing Smaller or No Tusks at All As you can see from the title‚ the evolutionary topic I chose was Elephants. Now‚ it is not just the elephant its self I will be ranting on about‚ but the fact that‚ “In the last 150 years‚ the world’s elephant population has evolved much smaller tusks” (Chris et.al 2007). If not smaller tusks‚ then they have actually been growing no tusks whatsoever. Now why on earth would elephants start to evolve this way? Tusks are such an important aspect to an
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the study of ________in understanding evolution -Biogeography Human birth weight is a classic example of the result of -Stabilizing Selection In humans x-linked traits -Occur on the x chromosome “Survival of the fittest” may be a misleading phrase to describe the process of evolution by natural selection because -Survival matters less to the natural selection then reproductive success does How can 2 pea plants that have different genotypes for seed color be identical in phenotypes? -½ plants
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Citing specific examples‚ discuss the physiological‚ morphological‚ behavioral and anatomical adaptative traits of biomes in: a) ASAL ecosystems and b) Tundra ecosystems. 1. Critically examine the relevance of the theory of natural selection in biogeographical studies. DATE: AUGUST‚ 2011. ARID AND SEMI-ARID LANDS ECOSYSTEMS Introduction The deserts of the world are areas in which there is a great deficit of water. They are areas with great moisture shortage. This
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into different ‘varieties’ or races of human. According to Darwin‚ human form was shaped by the desire. Darwin gave out the idea that the most important result of sexual selection was in human brain size. He made the argument that men are larger‚ stronger‚ and fiercer than women because they had to fight for the opportunity to mate. Women were tenderer and less selfish because of the maternal instincts. Even pre-historic men had able to observe‚ think and invent idea naturally in order to keep their
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SOUL MATES: HOW WILL WE FIND THEM? “Have we ever met before?”‚ “You look familiar”‚ and “I think I know you” these lines are often spoke to someone you felt a sudden strong connection. According to theosophy‚ humans were androgynous- equally male and female. However‚ when humans incurred karma they were separated into a man and a woman. After all karmic debt are purged‚ the two unites and returns to the ultimate. This explains that each soul seeks its own better halves. Greek legend says that
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