Question

Name the type of cross that would help to find the genotype of a garden pea plant bearing violet flowers

Answer 1

ound seeds are a dominant phenotype therefore a pea plant with round seeds could be either (R/r) or (R/R)  

in order to test whether the plant is homozygous dominant or heterozygous cross the plant with a true-breeding wrinkly seeded plant, as wrinkly seeds are the recessive allele for this gene  

therefore  

(R/r) x (r/r) = 2/4 round seeds + 2/4 wrinkly seeds  

(R/R) x (r/r) = 4/4 round seeds  

depending on the results you achieve you'll known whether the plant is heterozygous or homozygous dominant