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MDCAT Biology QUESTION #11277
Question 1
Which of the following is an example of incomplete dominance?
  • ABO blood group inheritance
  • Snapdragon flower color (red $\times$ white $\to$ pink)✔️
  • Seed shape in peas
  • Color blindness inheritance
Correct Answer Explanation
Incomplete dominance occurs when the heterozygote shows an intermediate phenotype. In snapdragons, red (RR) crossed with white (rr) produces pink (Rr) offspring. ABO blood groups show codominance, pea seed shape shows complete dominance, and color blindness is X-linked recessive.