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 [...]
In this article we will discuss about the genotype and phenotype variations of corolla in plants. East in 1910, 1916 performed experiments on flower length in Nicotiana longiflora. He took two homozygous, pure breeding lines differing in flower length, one having 41 cm the other 93 cm for average length of corolla. The minor variations in flower length within a [...]