A) only expressed in a heterozygous organism
B) an observable property or expression of a trait in an organism
C) the specific genetic constitution of an organism
D) the variation of genes
E) cannot be determined by knowing genotype

A) are usually constructed using the phenotypic information of one generation
B) cannot determine whether a trait has a dominant or recessive pattern
C) use squares to represent females and circles to represent males on their diagrams
D) are not useful in deducing the genotypes of parents
E) provide information on the patterns of inheritance of a trait

A) there is partial phenotypic expression of one member of a gene pair in the homozygous condition
B) there is full phenotypic expression of both members of a gene pair in the heterozygous condition
C) the interaction of two or more non-allelic genes controls a single phenotype
D) two recessive alleles interact and express themselves as a single dominant trait 
E) the phenotype of a heterozygote is intermediate to those of the parents