Classification, Dichotomous Keys and Cladograms

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What is the purpose of scientific names in biology?

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Scientific names are used because they are recognized worldwide, allowing for clear and consistent communication about species.

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List the 8 levels of biological classification from most broad to most specific.

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Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species.

Front

What is a cladogram?

Back

A cladogram is a diagram that shows the evolutionary relationships among various species based on shared characteristics.

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How do you determine which species are most closely related in a cladogram?

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The species that share the most recent common ancestor are considered the most closely related.

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What is a dichotomous key?

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A dichotomous key is a tool that allows the identification of organisms through a series of choices that lead the user to the correct name of a given item.

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What characteristics might you find in a tree that could help identify it using a dichotomous key?

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Characteristics may include leaf shape, bark texture, cone type, and overall size.

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What is biochemical evidence in the context of classification?

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Biochemical evidence refers to the analysis of DNA, proteins, and other molecular data to determine evolutionary relationships among organisms.

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What is a phylogenetic tree?

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A phylogenetic tree is a branching diagram that represents the evolutionary history of a group of organisms, showing how they are related through common ancestry.

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Why is it important to use scientific names instead of common names?

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Common names can vary by region and language, while scientific names provide a universal standard that avoids confusion.

Front

What can be inferred if two species share a high percentage of amino acid sequences?

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If two species share a high percentage of amino acid sequences, it suggests they are closely related and may have a recent common ancestor.