In the given cross, the parents are true-breeding. This means that their genotypes are homozygous for the traits that they are carrying: One parent would have the genotype b+b+ cn+cn+, while the other has the genotype bb cncn.
Wildtype fruit flies have gray bodies (b+) and red eyes (cn+) while mutant fruit flies have black bodies (b) and cinnabar eyes (cn). A parental (P) cross is performed between a true-breeding gray-bodied red eye fruit fly and a true-breeding black-bodied cinnabar eye fruit fly. What is the genotype and phenotype of the F1 flies?
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