Question

Additive Gene Action means:

• A. One allele completely masks another
• B. Only dominant allele express
• C. Only recessive allele express
• D. Both alleles contribute equally to phenotype

Hint:

Additive gene action = No dominance → Effects add up

Answer 1

The Correct Option is D

Concept:
Additive gene action refers to the situation where the effects of alleles at a locus add up to influence the phenotype.

Step 1: Understanding Additive Gene Action

• Each allele contributes independently.
• Total phenotype is sum of individual effects.

Step 2: Characteristics

• No dominance or masking
• Intermediate phenotype observed
• Important in quantitative traits

Step 3: Evaluating options
Option (A)

• Represents complete dominance Option (B)

• Dominant allele expression only Option (C)

• Recessive expression only Option (D)

• Correctly describes additive effect Final Conclusion: \[ \boxed{\text{Both alleles contribute equally to phenotype}} \]