The below mentioned article provides note on multiple alleles. After Mendel first advocated the existence of two factors for each character, it was demonstrated in many organisms that a gene consists of a pair of alleles. Each member of the pair of alleles is said to occupy an identical position or locus on each of the two homologous chromosomes in [...]
In this article we will discus about the blood group alleles in man. The ABO blood group system in man provides an excellent illustration of a multiple allelic system. If blood from two persons is allowed to mix outside the body, sometimes it will mix well, at other times there is clumping (agglutination) of red blood cells. The reason for [...]
In this article we will discuss about the self-incompatibility in plants. Sometimes bisexual plants produce functional male and female gametes, yet self-pollination does not lead to fertilisation and there is no seed setting. The pollen grains may fail to germinate on the stigma; or, even if pollen tubes are formed their growth may be inhibited. Such a condition where pollen [...]