OCR A Biology
Gene Epistatic Epistasis Hypostatic Protein Dominant Codes Pigment
Epistasis describes gene interactions where one gene masks or influences another's expression, with recessive epistasis occurring when recessive alleles hide an effect, and dominant epistasis involving a dominant allele's influence.
Epistasis is gene interaction where one gene affects another's expression. Recessive epistasis occurs when two recessive alleles at one locus mask the effect of another gene, while dominant epistasis involves a dominant allele at one locus influencing another gene's expression.
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Unexpected ratios - epistasis |
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- interaction of genes at diff loci, many genes interact epistatically so characteristics show continuous variation (involving many genes)
- gene affected by another gene is hypostatic and gene affecting expression of another gene is epistatic
- Dominant/reccessive epistasis - presence of 2 recessive alleles at epistatic gene leads to lack of protein forming (recessive epistasis), and if atleast a dominant allele present and it effects another gene its dominant epistasis (so protein formed by epistatic gene influences hypostatic gene)
- Labrador colours
- result of melanin, one gene codes for prod of pigment (B is black and b is brown), second gene codes for where pigment deposited (E is deposited in skin/fur and e is only on skin), gene at E locus epistatic to hypostatic gene at B locus
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OCR A Biology