Question

In case of summer squash which of the following is not right.

(a) The W allele produces a White substance

(b) A white substance is converted to Yellow when dominant Y allele is present

(c) The transformation of white substance to yellow is via green intermediate

(d) The green intermediate has combination at the Y locus y/y

The question was asked in a national level competition.

This key question is from Epistasis in portion Extension and Deviation from Mendelian Genetic Principles of Cytogenetics

Answer 1

Right option is (a) The W allele produces a White substance

To explain I would say: In this case there is a white substance initially produced which is converted to yellow via green intermediate. Y allele promotes the green to yellow conversion. White the W allele blocks the white to green conversion so further pathway is also blocked giving white summer squash.