Tuesday 14 May 2013

Co- Dominance and Mendel's mono hybrid ratio

So i have been studying mono hybrid ratio and incomplete dominance of alleles and so on in biology and i thought of something.
Mendel experimented with pea plants, tall and short (purebred), he then crossed them and the offspring (F1) was tall. So the dominance was of the tall allele. He then bred F1, with another F1 and found that the offsprings were 3 tall and 1 short. This became to be known as the monohybrid ratio. 
Incomplete dominance is when both the alleles are present but neither is dominant over the other and thus both is expressed and visible in the offspring. Such as the roan cattle which has both white and red/brown fur together giving it a roan colour. 
Thinking of all this something came up in my mind. When an African is crossed with an Anglo Saxon, the colour of the offspring is a light brown/olive colour. Therefore, incomplete dominance as neither of the alleles are dominant over the other. Now, if the offspring was crossed with another offspring who had parents that were Anglo Saxon and African, would their offspring (F2) follow the mendelian ratio. As in, would their offspring be, 3 dark and 1 light? or 3 light and 1 dark? 
Does it work differently for humans than plants and animals? I'll probably have to ask my science teacher about this. Anyways, back to studying legal studies.

laters :)

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