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Module 1: Selección natural

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Tabla de variación

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Biology - Variation table

Variation table

Variations may be structural, physiological, biochemical and behavioural.

VARIATION
EXAMPLES

Structural
More obvious in domestic animals which have been bred for particular
traits; e.g. cats with/without tails; dogs with flattened or elongated
snouts and hair of different textures and length; horses of different
maximum size; plant height of peas; ability to produce muscle protein etc.

Physiological
Variation in resistance to disease; ability of humans to distinguish
red/green; tasting or smelling certain chemicals

Biochemical
Blood types of humans; variation in production of particular enzymes
which affect phenotypes; kernel colour of maize

Behavioural
Differences evident particularly in relation to the differing degrees of
learned behaviours

Developmental
Differences due to stage in life cycle, for example, between juvenile
and adult leaves of eucalypts

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