Select all that apply. which of the following statements are true? a purebred organism can either be tt or tt. the combination of two genes determines the genetic trait of an organism. recessive genes will sometimes be masked by dominant genes. it is possible for two genetically different plants to have the same phenotype.

The answer would be:
The combination of two genes determines the genetic trait of an organism.
Recessive genes will sometimes be masked by dominant genes.
It is possible for two genetically different plants to have the same phenotype.
The phenotype expressed by the gene depends on the interaction of both alleles. Heterozygous individual will express the dominant gene since and recessive genes are masked. That means a heterozygous and homozygous dominant(two different genes) will express the same phenotype.
So, a purebred could be either heterozygous or homozygous dominant, or homozygous recessive.