If two or more genes affect one characteristic of the phenotype, that type of inheritence is said to be:

If two or more genes affect one characteristic of the phenotype, that type of inheritance is said to be Polygenetic Recessive genes are not expressed if a dominant is present, however, recessive genes still may cause diseases.

Explanation:

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.