Labrador coat colour genetics (again!)

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Viewing 13 posts - 16 through 28 (of 28 total)
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  • #70700
    GSPmad
    Member

    if I remember right black has to have E and B, choc has to have E and b, yellow has to have e with either B or b. But that’s from memory so may have remembered wrong.

    #70701
    GSPmad
    Member

    which would mean choc EEbb or Eebb, yellow eeBB eeBb or eebb (think it affects whether they have black or paler noses and pads re whether B or b). black EEBB EeBB EEBb EeBb

    I think.  :-\

    #70702
    Gracie
    Member

    e  E yellow, B black b brown

    ee is yellow dominant EE Ee are recessive in appreance
    ee overrides everything including black BB 🙂
    BB Bb is black
    bb is brown

    so dad could be either EEbb or Eebb

    depends on if mum is eeBB or eeBb
    as 
    mum x dad

    eeBB x EEbb = all black

    eeBB x EeBb = yellow and black  50 / 50

    eeBb x EEbb black and brown 50 / 50

    eeBb x Eebb yellow black and brown  50 yellow/ 25 /25

    wow i got that right just looked up the % on Bevs post

    There will be at least 25% of black pups the only way there wouldnt be is if mum is eebb but if she produced black pups with choc dad before she must be either eeBB or eeBb

    eebb eeBB eeBb are all yellow dogs as ee makes them yellow
    Eebb EEbb are brown as bb is dom over Ee EE
    EeBB EEBB EeBb EEBb are all black as B is dom over b and over EE Ee
    🙂

    #70703
    Anonymous
    Guest

    That’s excellent Gracie  ;D

    So basically – we know mum is

    eeBB

    (so def no choc puppies)

    Dad could be:  EEbb or Eebb

    which means puppies either:

    eeBB x EEbb = all black
    so Dad must be Eebb – cos they are expecting some yellow:

    eeBB x Eebb = yellow and black  50 / 50  ;D

    but 50 / 50 is only probability – so am guessing could be all yellow or all black?

    #70704
    GSPmad
    Member

    Black is dominant.Just checked on the genetics link.

    Black is EEBB or EeBB or EEBb or EeBb
    Choc is EEbb or Eebb
    Yellow is eeBB eeBb or eebb

    #70705
    GSPmad
    Member

    So am confused why you know mum is eeBB not eeBb or eebb.  ??? is it cos she had a litter of all blacks – but was that to a black stud a choc stud or a yellow stud?  ???

    I get EEbb x eeBB = all black
    EEbb x eeBb = half choc half black
    EEbb x eebb = all choc
    Eebb x eeBB= half black half yellow
    Eebb x eeBb= half black half yellow
    Eebb x eebb = half choc half yellow.

    sorry don’t know if that’s same as what’s been said, or even if i have done it right, brain can’t cope on too little sleep.

    #70706
    Anonymous
    Guest

    we worked out mum was eeBB on previous thread you posted the link to  🙂

    She had all black puppies when mated to a choc before.

    #70707
    Gracie
    Member

    [quote author=GSPmad link=topic=12977.msg249968#msg249968 date=1226069968]
    Black is dominant.Just checked on the genetics link.

    Black is EEBB or EeBB or EEBb or EeBb
    Choc is EEbb or Eebb
    Yellow is eeBB eeBb or eebb
    [/quote]

    Yes Black is dominant, but not over ee !!  🙂

    and[quote author=GSPmad link=topic=12977.msg249972#msg249972 date=1226070556]
    So am confused why you know mum is eeBB not eeBb or eebb.  ??? is it cos she had a litter of all blacks – but was that to a black stud a choc stud or a yellow stud?  ???

    I get EEbb x eeBB = all black
    EEbb x eeBb = half choc half black
    EEbb x eebb = all choc
    Eebb x eeBB= half black half yellow
    Eebb x eeBb= half black half yellow
    Eebb x eebb = half choc half yellow.

    sorry don’t know if that’s same as what’s been said, or even if i have done it right, brain can’t cope on too little sleep.
    [/quote]

    Thats right apart from Eebb x eeBb can produce black yellow and brown 🙂

    #70708
    Gracie
    Member

    anyway more to point  ;D, when will you be bringing this puppy home Sarah and do you want boy or girl or are you not fussed as long as it black?!  🙂

    #70709
    Anonymous
    Guest

    I want a black girl  ;D  Mating has happened… just waiting to find outr if she pregnant – and also want to look at full pedigree before deciding  :yes:

    Leon is not totally sure about getting a second one now… but will both decide whether it’s possible and hopefully get a puppy in March as they would be due at end of Dec  ;D

    #70710
    Gracie
    Member

    how exciting!!  🙂

    #70711
    GSPmad
    Member

    yep, i found some yellows appearing where i wasn’t expecting them when i redid it.  ;D

    what i meant was E and B are the dominant genes , e and b are the recessives, therefore black is dominant colour. tho need both E and B for black. brain is dead today, sorry.  🙂

    so possible pitter patter of tiny paws in march.  ;D

    hope you are going to keep us updated with lots of baby pics from birth – important to have lots of pics, even if you’re not getting one.  ;D

    #70712
    Gracie
    Member

    no but E isnt domiant, nor is e really as EE Ee are recessive to black and brown but ee is top dog!! it overrides anything  🙂

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