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Refer to this post hope it will helpPLEASSEEEEE ! Explain, using examples, how the environment may affect the phenotype of an
organism. [8] (I need brief detailed explanation) its a pastpaper Q's
I guess i can help with the first one..
Variations are of two types-phenotypic and genotypic..
Genotypic variations are influenced by genes only whereas phenotypic variations are influenced by both environment and their genes.
Simple examples include eating habits which are responsible for a person's growth..Lets say the person has a gene for tallness but only if the person acquires the required protein will he able to grow tall..Similarly obesity can also result this way as we choose it for us- by eating fatty foods..( i mean the environment is wat has an effect on the phenotype)
Phenotypic variations can also be due to selection pressures..
Here we can take the peppered moth biston betularia as an example..(given in bio text book)
Initial stages all people cud find was moths with pale wings and dark markings giving a speckled appearance.
In the 19th century once industrialisation started growing rapidly in certain areas the numbers of black moths started appearing..
The selection pressure here was the predation of birds coz in areas of industrialization there was polluted air which often covered the tree branches with soot and black moths seem to be better camouflaged than the speckled ones. These selection pressures gives rise to variations enabling "survival of fittest" where organisms with best adapted variations suited to that environment survive.Overtime this causes a genetic drift and change in allele frequency resulting in the ''birth'' of black peppered moths..(This is like an elaborated example)..
So u can go on with more examples as given in the text...
Hope this helped!!