Self Directed Learning

Many animals were soft-bodied and others had hard parts but their most visible and noticeable feature Is their substantial diversity. Cambrian Explosion – the sudden appearance and rapid diversification of complex animals over several millions of years. Most basic animal plans existed at least 100 million years before any were preserved as fossils. It Is based on differences such as those In amino acid sequence or It could be differences In nucleotide sequence of a particular gene.

The Increase In atmospheric oxygen above critical concentration due to Increased photosynthetic activity permitted outer covering to evolve. Also, because of the increase in atmospheric oxygen facilitation happened. Evolutionary relationship can be by morphological means, developmental, physiological, biochemical and, genetic similarities and differences. Before evolutionary relationship is considered, animals are categorized through similarities and differences. Phenotype may be a very misleading indicator. Convergence – distantly related animal may come to resemble each other in some ways.

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The Polymerase Chain Reaction (PC) – permits biologist to very quickly generate copies of a specific DNA which is used for further studies. Homology – centerpiece of phylogeny detective work. Homologous – morphological feature that share a common evolutionary origin. – developed through similar pathways controlled by the same genetic instruction – example : human cranium with the cats’ and dogs’ Basic approaches to deducing evolutionary relatedness: 1 . Phonetics (Numerical Taxonomy) – not having to deal with the issue of character homology and polarity.

Instead, set taxonomic group that reflects overall similarities alone. 2. Evolutionary Systematic (Classical Taxonomy) – focuses at the issues of homology as the outlet of analysis. This method requires a lot of time and Is painstakingly slow. It also lacks objectivity and strict standardized methodology or process. 3. Classicists (Phylogeny Systematic) – was one of the several well-defined procedure and number of widely available, highly sophisticated computer programs. It Is Interested only in homologous that are not present In any of Its ancestors.

Evolutionary relationship can somehow be uncertain because of the new technology that gives out only hypothesis but because of the eagerness to draw conclusion It Is In some way accepted. Many had their petitions with classicists. Some with the reason not requiring years of experience working with the animals under consideration Is very democratic. Even If every clients In this world agreed on a certain type of evolutionary relationship, the results Is not 100% precise or correct unless a time travel machine is invented. D others had hard parts but their most visible and noticeable feature is their substantial diversity. Cambrian Explosion – the sudden appearance and rapid plans existed at least 100 million years before any were preserved as fossils. It is based on differences such as those in amino acid sequence or it could be differences in nucleotide sequence of a particular gene. The increase in atmospheric oxygen above critical concentration due to increased photosynthetic activity permitted outer homology as the outlet of analysis.

This method requires a lot of time and is It is interested only in homologous that are not present in any of its ancestors. That gives out only hypothesis but because of the eagerness to draw conclusion it is in some way accepted. Many had their petitions with classicists. Some with the reason not requiring years of experience working with the animals under consideration is very democratic. Even if every scientist in this world agreed on a certain type of evolutionary relationship, the results is not 100% precise or correct unless a time