Unformatted text preview: • The expression of the trait that results in the physical appearance of an organism is called the phenotype in contrast to the genotype , which is the actual genetic constitution. • The alleles do not necessarily express themselves equally; one trait can mask the expression of the other. The masking factor is the dominant trait, the masked the recessive . • If both alleles for a trait are the same in an individual, the individual is homozygous for the trait, and can be either homozygous dominant or homozygous recessive. • If the alleles are different—that is, one is dominant, the other recessive—the individual is heterozygous for the trait. (Animal and plant breeders often use the term “true-breeding” for homozygous individuals.)...
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- Fall '08
- Genetics, Trait, homologous chromosomes