A reduction of the amount of product of a particular gene is observed due to a mutation. This type of a mutation is called

Deletion

When a small segment of chromosome is missing a mutation is called deletion. Since chromosome are made of DNA and DNA constitutes genes so Genes are actually present on chromosomes and when a small segment of chromosomes went missing reduced amount of genes is observed

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

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