Variation
Living organisms will have variation in genetic and environmental factors:
Genetic factors
Gene types: sperm and ova made in reproductive organs contain different types of genes. (In human sperm and ova both contain one pair of 23 chromosomes).
Combination: Different types of genes combine when sperm and ova join during fertilisation. (A male and female human can produce billions of phenotypes).
Mutations: spontaneous formation of new and altered genes.
Genetic factors
Gene types: sperm and ova made in reproductive organs contain different types of genes. (In human sperm and ova both contain one pair of 23 chromosomes).
Combination: Different types of genes combine when sperm and ova join during fertilisation. (A male and female human can produce billions of phenotypes).
Mutations: spontaneous formation of new and altered genes.
Environmental factors can affect the growth of living organisms.
e.g. weather conditions, temperature, pH levels and salinity
e.g. weather conditions, temperature, pH levels and salinity
Looking at links below on the topic 'Coloration of Peppered Moths'
Briefly discuss how pollution has affected variation within moth populations.
http://www.echalk.co.uk/Science/tasters/biology/Peppered_Moth.swf
http://peppermoths.weebly.com/
Note and Questions adapted from:
Stannard, P. & Williamson,K. (2000). Species Survival. In Stannard, P. & Williamson,K. (2nd ed.), ScienceWorld 10 (pp. 191-194). South Yarra, Vic. : Macmillan Education Australia
Briefly discuss how pollution has affected variation within moth populations.
http://www.echalk.co.uk/Science/tasters/biology/Peppered_Moth.swf
http://peppermoths.weebly.com/
Note and Questions adapted from:
Stannard, P. & Williamson,K. (2000). Species Survival. In Stannard, P. & Williamson,K. (2nd ed.), ScienceWorld 10 (pp. 191-194). South Yarra, Vic. : Macmillan Education Australia