There are two questions on this system Answer the other one

There are two questions on this system. Answer the other one first. The leaf edges of pineapple can be uniformly spiny spiny on the leaf tip piping, i e. with nice smooth edges that resemble cloth piping folds Pineapple growers prefer varieties that are piping because harvesting them is safer and easier. The following crosses were carried out using pure breeding varieties whose phenotype is indicated is indicated as piping, spiny tip, or spiny. Two pure bred parents are named as W and Z for later reference in the answers. Pure Pure breeding F1 F2-Spiny F2-Spiny tip F2-Piping breeding P1 P2 Piping Piping Spiny 23 85 (variety Spiny Spiny tip Spiny tip 15 50 none Piping Spiny tip Piping (variety Z) 27 88 Piping Piping Spiny (variety Z) 18 60 none You conclude that in regard to the two genes controlling the leaf edge phenotype, variety W and Variety z have the following genetic relationship. O Wis dominant for both genes, Z only for one O Wis dominant for on one, Z dominant for both genes O Wand Zhave the same genotype at both loci O Wis recessive for both genes, Z dominant for both O each is dominant for one only and not the same one

Solution

Spiny outcome was the least after cross breeding and both the genes shown dominating phenotypic characteristics in offspring so

Two genes at work, Spiny is double recessive

As both W and Z are true breeding plants

W is recessive for both genes and Z is dominant for both.