genetics training [p--frostsoul&i]

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    So, we're going to start with the B-locus. This is generally considered the "black factor." Now for a term that you may be unfamiliar with, this is eumelanin. That means it's black bases. Whereas pheomelanin is red based, or "red factor." This will become more important in a later lessons.


    This is what's on the B-locus:
    B - Black
    b - chocolate
    bl - cinnamon


    That is the order of dominants too. Black is dominant to chocolate and chocolate is dominant to cinnamon. Cinnamon is recessive to both, therefore. Because of dominant and recessive genes, these cats can carry the other gene. However, there are only two alleles. So they cannot carry black, chocolate AND cinnamon at the same time.


    BB - Black
    Bb - Black carrying chocolate
    bb - Chocolate
    bbl - Chocolate carrying cinnamon
    blbl - Cinnamon


    Do you have any questions so far? If you think you're comfortable with this, I'll talk about pairing them up and let you do a little practice.

    i think i've got it pretty well; the only question i have is this: is it possible to be black carrying cinnamon? like, if there were a cross between a black cat (BB) and a cinnamon cat (blbl), would there be a cat who was Bbl?

    Yes there is, I forgot that!


    Okay, so let's work with a few punnet squares. Once you workout the genotypes, see if you can tell me the phenotypes.


    Bb x bb


    Bbl x blbl


    bb x blbl


    bb x bbl


    BB x bb


    BB x Bb

    Bb x bb [Bb, bb, Bb, bb] will result in black carrying chocolate and chocolate


    Bbl X blbl [Bbl blbl Bbl blbl] will result in black carrying cinnamon and cinnamon


    bb x bbl [bb bb bbl bbl] will result in chocolate and chocolate carrying cinnamon


    bb x blbl [bbl bbl bbl bbl] will result in chocolate carrying cinnamon


    BB x bb [Bb Bb Bb Bb] will result in black carrying chocolate


    Bb x Bb [BB BB Bb Bb] will result in black and black carrying chocolate


    i hope i did it in an alright form type thing xD

    It's not rude, I've just been really busy. You got them all correct!


    Okay so now we're going to toss on dilute.


    DD = Dense.
    Dd = Dense.
    dd = Dilute.


    Black --> Blue.
    Chocolate --> Lilac.
    Cinnamon --> Fawn.


    So basically a black cat could be like this: Bb Dd.
    And a blue cat could be like this BB dd.


    I find doing the punnet squares separately and combing the results is easiest. For example, if you get a punnet square that gives you all Bb, then you know they're black. Then you do the punnet square and get DD, Dd, dd, you know you CAN get dilutes as well as dense. So combing them gives you a total of black AND blue.


    Does that make sense?