JanaALEVEL
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I'm not sure I know exactly what that is. Shouldn't there always be a gene for eye colour ( for example ) and one for hair colour etc etc ? Then what is the genetic variation that exists between 2 different species of lemurs, for example ?
Do they have a different number of genes? Or do they have the same "types" of genes but different sequences of nucleotides in each gene ?
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haseebj49
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(Original post by JanaALEVEL)
I'm not sure I know exactly what that is. Shouldn't there always be a gene for eye colour ( for example ) and one for hair colour etc etc ? Then what is the genetic variation that exists between 2 different species of lemurs, for example ?
Do they have a different number of genes? Or do they have the same "types" of genes but different sequences of nucleotides in each gene ?
Don't worry, this isn't a stupid question - it is quite a difficult concept to get your head around (:

So you know about the specific sequences of nucleotides coding for amino acids and they combine to form a protein. But the variation part comes from alleles.
An allele is an alternate form of a gene - bit of coding that has a certain position (locus) on a chromosome.
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JanaALEVEL
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(Original post by haseebj49)
Don't worry, this isn't a stupid question - it is quite a difficult concept to get your head around (:

So you know about the specific sequences of nucleotides coding for amino acids and they combine to form a protein. But the variation part comes from alleles.
An allele is an alternate form of a gene - bit of coding that has a certain position (locus) on a chromosome.
Does that mean that when a gene is being compared between two species, they compare its position on the chromosome ?

And is the general idea of genetic variation within a species and between 2 species the same thing ? (meaning, in both the genetic variation is due to the alleles ?) But between 2 species there are more differences ?
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haseebj49
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(Original post by JanaALEVEL)
Does that mean that when a gene is being compared between two species, they compare its position on the chromosome ?

And is the general idea of genetic variation within a species and between 2 species the same thing ? (meaning, in both the genetic variation is due to the alleles ?) But between 2 species there are more differences ?
That's a lot more complicated than we need to know for the A-level spec lmao
If you want to read about it, you can find some info on here: http://humanorigins.si.edu/evidence/genetics
Hope this helps tho (:
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