The first thing to consider is whether you are looking at monozygotic (identical) twins or dizygotic (fraternal) twins. The other important fact that must be considered is that genes alone are not usually causative for a disorder which follows the standard rule of phenotype = genotype + environment. In practical terms this means that unless a particular gene effect is completely "penetrant", that is it always causes an effect when it is inherited, twin studies could assign no effect to a particular gene that is only partly penetrant. In the cause of psychological and neuropsychiatric diseases, they are usually not monogenic but the result of numerous genes and environmental influences.
Use of fluorescent molecules by Lowenstein and colleagues to determine the size of gap-junction chan
Genetic changes that convert proto-oncogenes to oncogenes
Factors influencing character of respirations
An old concept of genetic transmission—a homunculus in a sperm cell.
Common eye and vision problems
The recent mass upheavals in Tunisia, Egypt, Libya, Yemen, and Syria gave political scientists a cha