Q.
When dominant and recessive alleles express itself together it is called
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AIPMTAIPMT 2001Principles of Inheritance and Variation
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Solution:
Dominance is the phenomenon in which one member of a pair of allelic genes expresses itself as a whole (complete dominance) or in part (incomplete dominance). Codominance is when the two genes neither show dominant-recessive relationship nor show intermediate condition, but both of them express themselves simultaneously. This has been reported in roan character of cattle (i.e patches of 2 different colours on the skin). Pseudodominance is when a recessive allele of normal homologous chromosome will behave like a dominant allele and will be phenotypically expressed.