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DICHOTOMOUS KEY || PAST PAPER DISCUSSION || IGCSE/GCSE || BIOLOGY  || https://www.l2htuition.com

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Liveworksheets transforms your traditional printable worksheets into self-correcting interactive exercises that the students can do online and send to the teacher.

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Lesson Explainer: Dichotomous Keys | Nagwa

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Lesson Explainer: Dichotomous Keys | Nagwa

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In this explainer, we will learn how to design and use a dichotomous key.

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definizione

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Skill:
A dichotomous key is a method of identification whereby groups of organisms are divided into two categories repeatedly

With each sequential division, more information is revealed about the specific features of a particular organism

When the organism no longer shares its totality of selected characteristics with any organism, it has been identified

When using a dichotomous key to identify specimens it is preferable to use immutable features (i.e. features that do not change)

Size, colouration and behavioural patterns may all vary amongst individuals and across lifetimes

Physical structures (e.g number of limbs) and biological processes (e.g. reproduction methods) make for better characteristics

Dichotomous keys are usually represented in one of two ways:

As a branching flowchart (diagrammatic representation)

As a series of paired statements laid out in a numbered sequence (descriptive representation)

Below are some examples of dichotomous keys represented as both diagrams and descriptions (click on image to swap):

Dichotomous Key: Invertebrate Phyla

Dichotomous Key: Vertebrate Classes

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Construction of dichotomous keys for use in identifying specimens

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How to Make a Dichotomous Key. A dichotomous key is a way of identifying specimens based on contrasting statements, usually about physical characteristics. By drawing a series of contrasts, you are able to narrow down the specimen until...

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esempio 1

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using dichotomous key with vertebrates - 2

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using dichotomous key with vertebrates - 2

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esempio 2

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esempio 3

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esempio

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using dichotomous key