Question
Biology Question on Principles of Inheritance and Variation
When dominant and recessive alleles express itself together it is called
A
co-dominance
B
dominance
C
amphidominance
D
pseudo dominance.
Answer
co-dominance
Explanation
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.