Question

With the following crosses of pea plants, give the flower color of offspring and the ratio expected (blue is dominant). A cross of blue x blue (both heterozygous would result in?

Answer 1

3 blue, 1 white
Let blue be represented as B and white be represented as b
genotype of heterozygous blue plant: Bb
Cross = Bb x Bb
Possible genotypes of offspring: BB, Bb, Bb and bb
Thus, as can be seen, three of the four offsprings will be blue and one will be white. 

hope this helps :^)