Home › NEET UG › Biology › Principles of Inheritance and Variation › Which of the following is a characteristic of po…
Which of the following is a characteristic of polygenic inheritance?
AThree or more genes contribute to the phenotype, with each allele's effect being additive
BOnly homozygotes express the phenotype
COne gene affects multiple traits
DThe phenotype shows a clear 3:1 ratio
Answer & Solution
Correct answer: A. Three or more genes contribute to the phenotype, with each allele's effect being additive
**Polygenic inheritance** = ≥3 genes affecting one trait; effects are **additive** (each dominant allele adds a small contribution). Produces a continuous gradient, not discrete Mendelian ratios.
Related questions
Haemophilia and colour blindness are MORE COMMON in MALES than females because they are:Down syndrome is most commonly caused by:Sickle cell anaemia is caused by:The sex of a human baby is determined by:In the human ABO blood group system, a person with blood group AB has the genotype:In snapdragon (Antirrhinum), RR (red) × rr (white) gives F1 plants that are PINK. This patIn a DIHYBRID cross of YyRr × YyRr, the F2 phenotypic ratio is:In a monohybrid cross of Tt × Tt, the F2 PHENOTYPIC ratio is: