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Single gene diseases only effect one typeof gene where im a complex genetic disease many genes are effected. An example of a single gene diseas is sickle cell anemia. Cancer would be an eexample of a complex gene disease.
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What is the difference between two things?
The difference between two things is what traits or characteristics set them apart; why they are different. For example:Water and IceThe difference between water and ice is that water is a liquid and water is not. Another thing is that ice is very cold and water can be warm.
What is the difference between selective breeding and natural selection?
In natural selection, the animals take time and evolve slowly. In selective breeding, humans can transfer genes from one organism into another organism.
Why is it that lamarck's suggestion that organisms arise spontaneously and then become increasingly more complex is not supported by the theory of natural selection?
Because lamarck thought that traits organisms aquired during their lifetime would be passed on to offspring. He believed that traits were determined by use or disuse. However, aquired traits cannot be passed on to offspring, only traits determined by DNA can.
What do variation and competition have to do with natural selection?
Variation and competition are the basis of natural selection.When a population of organisms has variety (big/small, fast/slower, etc), and there is competition, then some of those traits will assist in winning the competition, and some will not, which will tend to mean the difference between an organism surviving versus not surviving, which in a large population will mean passing the genes for those advantageous traits on, which then means that those traits have been 'selected' for by the natural act of competition, thus 'natural selection'.
How does the range of phenotype differ between single-gene traits and polygenic traits?
Single gene traits are either one type or another,for example everyone is either (ABO System) group A,B AB or O with no intermediates - this shows discontinuous variation. In polgyenic traits, continuous variation is shown and there is a range with no discrete categories - height
