First slide

Inheritance of One Gene

Question

Gene for starch synthesis in pea plant is functionally connected with the

Easy

A

chlorophyll synthesis
B

shape of seed
C

shape of pod
D

flower colour

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.

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