No oxygen to be transported to that specific part of the brain causing for that specific part of the brain to not function properly because red blood cells carry oxygen for the brain (which is an organ that needs oxygen) to do its job
Examples of recessive diseases include cystic fibrosis and Tay-Sachs disease. Multifactorial inheritance disorders are caused by a combination of small inherited variations in genes, often acting together with environmental factors. Heart disease, diabetes, and most cancers are examples of such disorders.
3 years isnt as much as others out there