Question 57 – Inheritance - OCR GCSE Biology Questions

In summer squash (Cucurbita pepo), fruit colour is determined by two independently assorting genes, $W\,$ and $Y$ . The biochemical pathway for pigment synthesis is shown in the diagram below:

Pigment synthesis pathway

The dominant allele $W\,$ produces an active inhibitor protein that blocks the conversion of the colorless precursor into green pigment. The recessive allele $w\,$ produces a non-functional protein that does not inhibit this step.
The dominant allele $Y\,$ codes for a functional enzyme that converts green pigment into yellow pigment. The recessive allele $y\,$ codes for a non-functional enzyme.

A dihybrid squash plant with the genotype $WwYy\,$ is self-pollinated.

What is the expected phenotypic ratio of white : yellow : green fruits in the $F1\text{F}_1$ offspring?

In summer squash (Cucurbita pepo), fruit colour is determined by two independently assorting genes, $W\,$ and $Y$ . The biochemical pathway for pigment synthesis is shown in the diagram below:

Pigment synthesis pathway

The dominant allele $W\,$ produces an active inhibitor protein that blocks the conversion of the colorless precursor into green pigment. The recessive allele $w\,$ produces a non-functional protein that does not inhibit this step.
The dominant allele $Y\,$ codes for a functional enzyme that converts green pigment into yellow pigment. The recessive allele $y\,$ codes for a non-functional enzyme.

A dihybrid squash plant with the genotype $WwYy\,$ is self-pollinated.

What is the expected phenotypic ratio of white : yellow : green fruits in the $F1\text{F}_1$ offspring?

Inheritance

Question 14

Inheritance

Question 14

Inheritance

Question 14

Inheritance Questions

Inheritance

Question 14

Inheritance Questions