Question

A purple-flowered plant that carries two different color traits such as purple and white is __________.

Answer 1

purple is phenotype of dominant allele, white is phenotype of recessive allele
you can write the genotype as Pp (P means purple, p means white)
Usually 'big' letter means dominant, 'small' letter means recessive

I hope this answer your question

Answer 2

... And to add to yukitou's very good hint, when an organism has two of the same alleles, it is said to be "homozygous." When the alleles differ it is "heterozygous."

Answer 3

heterozygous alleles as Blues said

Answer 4

PP is homozygous dominant
pp is homozygous recessive
Can you see what does 'homozygous' means?

Pp is heterozygous. Can you see what 'heterozygous' means after comparing with the 'homozygous'?