qualitative traits - Those in which there is a sharp distinction between phenotypes (e.g., red or black color). Usually, only one or two gene pairs are involved.
quality - Quality is something special about an object that makes it what it is; a characteristic, attribute, excellence. Quality is the composite or attribute of an animal or product that has economic or aesthetic value to the user; meeting or exceeding each customer’s expectations at a cost that represents value to the customer every time.
quality grades - Grades such as Prime, Choice, and Select that group slaughter cattle and carcasses into value- and palatability-based categories. Grades are determined primarily by marbling and age of animal.
quantitative traits - Those in which there is no sharp distinction between phenotypes, with a gradual variation from one phenotype to another (such as weaning weight). Usually, many gene pairs are involved, as well as environmental influences.