Presentation on theme: "INHERITANCE Variation G R Davidson. Variation Animals and plants reproduce to ensure the survival of their species. If any type of organism did not reproduce,"— Presentation transcript:
INHERITANCE Variation G R Davidson
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.
Variation “Organisms belong to the same species if they can interbreed to produce fertile offspring.”
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.
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.
Continuous Variation e.g. Shell diameter in limpets.
Continuous Variation e.g. human hand span
Continuous Variation e.g. weight
Continuous Variation e.g. Height
Discontinuous Variation If the variation in a characteristic shows a definite number of easily observed clear- cut types, the characteristic shows DISCONTINUOUS VARIATION.
Discontinuous Variation e.g. eye colour
Discontinuous Variation e.g. blood type
Discontinuous Variation e.g. flower colour
Discontinuous Variation e.g. ear lobes Attached lobeUnattached lobe