Zoology - Principles of Inheritance and Variation Question with Solution | TestHub

Starch grain size in pea is controlled by gene Bb which in the dominant state produces an enzyme starch debranching enzyme (SBE). Starch is synthesized effectively by BB homozygotes and therefore large grains are produced. In bb, homozygous have lesser efficiency in starch synthesis and produce smaller starch grains. In Bb heterozygous condition starch grains produces are intermediate in size thus shows incomplete dominance.