Mendel crossed two plants that were heterozygous for purple flower color. which genotypes could he have used to represent the cross?

a. pp 'pp
b. pp'pp
c. pp'pp
d. pp'pp

The answer is B. Pp Pp. 
An Allele can be dominant or recessive. Individuals can be homozygous or heterozygous; such that individuals who are homozygous for a certain gene carry two copies of the same allele while individuals who are heterozygous for a certain gene carry two different alleles.  
In this case;Pink color is dominant over the other color, therefore; Heterezygous pink would be Pp
Homozygous pink would be PP
Homozygous recessive would be pp 

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