Question

A student crosses two snapdragon plants.
- Plant 1 has yellow flowers (YY).
- Plant 2 has blue flowers (BB).

All of the offspring plants have green flowers (YB).

Which type of inheritance do these plants exhibit?

A Polygenic
B Codominant
C Incompletely dominant
D Autosomal recessive

Answer 1

C — Incompletely dominant.

Explanation: The Y and B alleles produce distinct homozygous phenotypes (yellow and blue). The heterozygote (YB) shows an intermediate, blended phenotype (green), which is characteristic of incomplete dominance (not codominance, polygenic inheritance, or simple recessive inheritance).