Some Special Cases of Heredity-Inheritance of Human Traits

Some diseases are caused by genetic abnormalities like hemophilia, other diseases may influenced more by genes. For example, a tuberculosis, it is a disease and cannot be inherited but having a weak lungs can be inherited. Some histories of human families known that some diseases and disorders are associated with genes.

>DIABETES
This is likely a disease of my uncle. He is experiencing it right now, and I feel bad about it. This is a disease caused by a dominant gene. It is not equally serious in all people, and I have a proof for that, cause that more than one pair of genes are involved in its inheritance. But now, I don't think so that diabetes may or may not be an inherited disease. In fact, it has been known that viruses may cause diabetes.
>SICKLE-CELL ANEMIA
Incomplete dominant alleles may bring about genetic disorders too. Sickle-cell anemia is inherited as one kind of alleles. It's name hat gotten from the blood cells that often shaped like a sickles.These blood cells that I'm talking about have a limited ability to transport oxygen. In sicle-cell anemia, red blood cells are bent and twisted like sickles while the normal shape is round and flattened. It is caused by a change in one of the polypeptides found in hemoglobin. Hemoglobin is the protein that carries oxygen in red blood cells. A person inflicted with the disease is deprived of oxygen from nervousness etc. If this happens, the molecules in our hemoglobin will join together to form fibers, and these fibers cause the red blood cells to change in shape like a sickle-cell.
>KLINEFELTER'S SYNDROME
When an XY sperm unites with an X, the result is called Klinefelter's Syndrome or sexually underdeveloped male. A person having this syndrome, the testes are small, sperms aren't produce, breast are enlarged etc. It may occur in females. They produce eggs with XX or no sex chromosomes. When an XX egg unites with an Y sperm, will not developed "YO". This is because "YO" is lethal --it means it causes death.
>DOWN'S SYNDROME
Down's syndrome is usually produced by nondisjunction of chromosome 21 during oogenesis and sometimes during spermatogenesis. Where in, the no. of chromosomes is 47 instead of 46 chromosomes which is normal. The extra chromosome is not a sex chromosome but an autosome. Some do not know what's the real meaning of "mongoloids" and I don't know why, but, I want them to know the real meaning of "mongoloids" . "Mongoloids are those who shows mental retardation and have a shorter life expectancy. haha =)
>TURNER'S SYNDROME
Turner's syndrome is also caused by nondisjunction of the sex chromosomes. It results in female who lacks sex chromosomes. The genotype is XO instead of XX.Girls of this syndrome appear normal at birth but throughout their lives are shorter than other normal girls. Women with Turner's syndrome have large necks. Their sex organs and breasts do not develop to the adult stage, it means they are sterile. Klinefelter's syndrome and Turner's syndrome are all disorders of nondisjunction. Nondisjunction is the failure of chromosomes to separate properly during one of the stages of meiosis.