(c) labour intensive ; sterile conditions ; special equipment ; trained staff ; electricity / power, costs ; quality control of process ; AVP ; e.g. set up costs 3 max (d) grafting / budding / described ; layering / described ; 1 max [17] 93. (a) (i) epistasis ; dominant ; correct ref to epistatic and hypostatic gene ; ref to protein / enzyme / inhibitor, product of allele A ; prevents, transcription / translation ; inhibits, expression / gene action ; blocks enzyme activity ; 3 max (ii) small number of phenotypes ; distinct (phenotypic) classes ; qualitative ; two genes / AW ;
around 6 weeks old. The blue colour depends on the intensity of blue refraction. Blue eyes are a feature of colourpointed cats where the colour is linked to the temperature- dependent albinism that produces the colourpoint pattern. The blue colour varies in hue and intensity and breeders must selectively breed cats with the best eye colour to try to pass on that colour to the kittens. Blue eyes also occur in white cats and are associated with the epistatic white (often called dominant white) gene which is quite different from albinism because it masks an underlying coat colour. The white spotting gene also affects eye pigment if there are white patches around the eyes. White cats can have one or both eyes blue. The non-blue eye will be whatever colour the breed standard requires for example in white Persians, the other eye is vivid orange. In the randombred odd-eye white cats, the non-white eye might be green or
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