In dominant-recessive inheritance, the one allele that affects the child's characteristics is called

A dominant allele creates a phenotype individual who have one copy of allele from one parent that can affect the child’s characteristic; the other allele is called recessive, which has no effect on child’s traits. The dominant and recessive inheritance are both beneficial in terms of giving perceptions on the probability of a person inheriting a phenotypes especially with genetic conditions. 

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.