Help!! In this same cactus, purple flowers are dominant to yellow flowers. A cactus that has both...?

... two-pronged and one-pronged spines has yellow flowers. It is crossed with a two-pronged cactus with purple flowers (heterozygous). What are the phenotypes of the offspring and in what proportion?

Help!! In this same cactus, purple flowers are dominant to yellow flowers. A cactus that has both...?
Your question does not provide enough info to give a proper answer. We would also need to know:





(1) Is flower color controlled by a single gene (simple dominance) or multiple genes (complex dominance)?





(2) What is the dominant/recessive situation RE two-pronged vs. one-pronged spines? Is this a simple or complex gene dominance situation?





(3) Are the genes for flower color and spine prong number linked in some way, or completely unlinked.





Regardless of the answers to these questions, the mathematics involved could get pretty hairy. I would hazard a guess that you are enrolled in a class that is over your head or (more likely, based on my experience with biology professors in general) that your professor is a simpleton and has asked an unanswerable question.

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