The most frequent combinations of the X-linked recessive mode of inheritance are as follows: 1. The mother is homozygous and normal (XX); the father is hemizygous and affected (X'Y). (Here X' indicates the chromosome carrying the defective gene and X indicates the normal chromosome). All of the sons of this union will be normal and they will inherit the normal [...]
The following points highlight the three main types of inheritance with its characteristics. The types are: 1. Autosomal Dominant Inheritance 2. Autosomal Recessive Inheritance 3. Polygenic Disorders and Multifactorial Inheritance. Type # 1. Autosomal Dominant Inheritance: Farabee in 1905 gave the first description of a pedigree showing brachydactyly (short fingers and toes), an autosomal dominant trait. Some more examples are [...]
The below mentioned article provides an overview on the inheritance of blood groups in man. Generally a gene has two alternative forms or alleles, one in each of the homologous chromosomes. If a gene has more than two alleles, it is known to exhibit multiple alleles. Multiple alleles arise by mutation of the wild type gene and occupy the same [...]