Question

Which one of the following summer squash would be true breeding?

(a) Sphere

(b) Disc

(c) Long

(d) Short

This question was addressed to me in an international level competition.

This is a very interesting question from Gene Interactions topic in chapter Extension and Deviation from Mendelian Genetic Principles of Cytogenetics

Answer 1

Correct option is (c) Long

To explain I would say: The long phenotype is produced because of the recessive genes in both the locus. Thus it will be true breeding.