INHERITANCE

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INHERITANCE

• Variation

G R Davidson
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Variation

• Animals and plants reproduce to ensure the
  survival of their species.
• If any type of organism did not reproduce, this
  type or species of organism would become extinct.

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Variation
Organisms belong to the same species if they can
interbreed to produce fertile offspring.
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Variation
Variation in a species is the differences which
can occur between individuals of the same
species. Human examples height, pulse, blood
type, hand span, etc..
This variation within a species can either be
CONTINUOUS or DISCONTINUOUS.
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Continuous Variation
If the variation in a characteristic can be
measured and it shows a wide range occurring
between two extreme measurements it is
CONTINUOUS VARIATION.
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Continuous Variation
e.g. Shell diameter in limpets.
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Continuous Variation
e.g. human hand span
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Continuous Variation
e.g. weight
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Continuous Variation
e.g. Height
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Discontinuous Variation
If the variation in a characteristic shows a
definite number of easily observed clear-cut
types, the characteristic shows DISCONTINUOUS
VARIATION.
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Discontinuous Variation
e.g. eye colour
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Discontinuous Variation
e.g. blood type
AB
A
B
O
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Discontinuous Variation
e.g. flower colour
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Discontinuous Variation
e.g. ear lobes