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How to distinguish between Incomplete Dominance and Co-dominance in NEET multiple choice questions?
Both yield 1:2:1 phenotypic ratios in F2 generation instead of the classical 3:1 Mendelian ratio. What specific diagnostic keywords should I look for in questions to instantly identify which one applies?
Recommended Answer by Meera N.
Verified Educator
M.Sc Zoology • 11 yrs NEET Coaching
Here is the quick 10-second rule for NEET:
• Incomplete Dominance: Look for blending/intermediate phenotype where neither allele is fully expressed (e.g. Red × White Snapdragon = Pink flower).
• Co-dominance: Look for simultaneous, independent expression of both alleles without blending (e.g. ABO Blood Group IA IB produces both A and B antigens on RBC surface). Both parental traits coexist!
• Incomplete Dominance: Look for blending/intermediate phenotype where neither allele is fully expressed (e.g. Red × White Snapdragon = Pink flower).
• Co-dominance: Look for simultaneous, independent expression of both alleles without blending (e.g. ABO Blood Group IA IB produces both A and B antigens on RBC surface). Both parental traits coexist!
Community Answers & Discussion (1)
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MNVerified Tutor • 46 mins agoHere is the quick 10-second rule for NEET:
• Incomplete Dominance: Look for blending/intermediate phenotype where neither allele is fully expressed (e.g. Red × White Snapdragon = Pink flower).
• Co-dominance: Look for simultaneous, independent expression of both alleles without blending (e.g. ABO Blood Group IA IB produces both A and B antigens on RBC surface). Both parental traits coexist!
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