In a cultivar of summer squash (Cucurbita pepo), fruit colour is determined by the epistatic interaction of two genes, $W/w\,$ and $Y / y$ , which assort independently:

The dominant allele $W\,$ acts as an inhibitor, preventing the conversion of a white precursor molecule into any pigment. The recessive allele $w\,$ is non-functional, allowing pigment synthesis to proceed.
The dominant allele $Y\,$ codes for an enzyme that converts green pigment into yellow pigment. The recessive allele $y\,$ produces a non-functional enzyme, meaning the pigment remains green.

A plant heterozygous at both loci ( $W w Y y$ ) is self-pollinated. What is the expected phenotypic ratio of the $F_2\,$ offspring?

In a cultivar of summer squash (Cucurbita pepo), fruit colour is determined by the epistatic interaction of two genes, $W/w\,$ and $Y / y$ , which assort independently:

The dominant allele $W\,$ acts as an inhibitor, preventing the conversion of a white precursor molecule into any pigment. The recessive allele $w\,$ is non-functional, allowing pigment synthesis to proceed.
The dominant allele $Y\,$ codes for an enzyme that converts green pigment into yellow pigment. The recessive allele $y\,$ produces a non-functional enzyme, meaning the pigment remains green.

A plant heterozygous at both loci ( $W w Y y$ ) is self-pollinated. What is the expected phenotypic ratio of the $F_2\,$ offspring?

5.1 Inheritance

Question 7

Markscheme

5.1 Inheritance

Question 7

Markscheme

5.1 Inheritance

Question 7

5.1 Inheritance Questions

5.1 Inheritance

Question 7

5.1 Inheritance Questions