1. Tardigrade
  2. Question
  3. Biology
  4. In garden pea, starch synthesis is regulated by B and b alleles. Bb genotype produces:

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. In garden pea, starch synthesis is regulated by B and b alleles. Bb genotype produces:

NTA AbhyasNTA Abhyas 2020Principles of Inheritance and Variation

Solution:

A single gene product may produce more than one effect.
For example, starch synthesis in pea seeds is controlled by one gene. It has two alleles (B and b). Starch is synthesised effectively by BB homozygotes and therefore, large starch grains are produced. In contrast, bb homozygotes have lesser efficiency in starch synthesis and produce smaller starch grains. After maturation of the seeds, BB seeds are round and the bb seeds are wrinkled. Heterozygotes produce round seeds, and so B seems to be the dominant allele. But, the starch grains produced are of intermediate size in Bb seeds. So if starch grain size is considered as the phenotype, then from this angle, the alleles show incomplete dominance.