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共显性.
共显性(英語:codominance)是指在杂交后,亲代的表型同时表现在子代的某一性状中,即“又像父本又像母本”。简单的显性与隐性的情况中,等位基因中只有一个被表达。而在共显性的情况下,多于一个等位基因被表现出来。
比如在人的ABO血型系统中,AB型血的人(基因型为IA IB)红细胞表面同时有A抗原与B抗原,这是由于IA 与 IB等位基因共显性造成的。
假设亲本为不同的纯合子(如A1 A1与A2 A2)。
- 完全显性(complete dominance) :子一代所表现的性状都和亲本之一完全一样。
- 不完全显性(incomplete dominance): 子一代的性状表现是双亲性状的中间型。
- ISBN 0-07-246248-5 Hartwell,L.H & L.Hood,Genetics:FROM GENE TO GENONES,New York: McGrawHill, 2004.
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