The following points highlight the five major types of diseases of gene action in man. The types are: 1. Phenylketonuria 2. Alkaptonuria 3. Albinism 4. Tyrosinosis 5. Goitrous Cretinism. Disease of Gene Action in Man: Type # 1. Phenylketonuria: (i) Symptoms: This disease is characterized by high level of phenylalanine in blood, spinal fluid and sweat. High level of phenylalnine [...]
In this article we will discuss about the gene action in drosophila. Beadle and Ephrussi (1937) studied metabolic pathway for eye colour in Drosophila. There are three eye colours in the fruitfly, viz. wild, vermillion and cinnabar. Procedure: The imagine disc or primordia was transplanted from one larva on to the abdomen of other larva. Reciprocal eye transplantation was made [...]
Notes on Biochemical Genetics: 1. Gene Action 2. Metabolic Pathway 3. Metabolic Disorders 4. Genetic Control 5. Organisms Studied. Biochemical Genetic: Point # 1. Gene Action: The manner in which genes control phenotypic expression of various characters in an organism is known as gene action. In other words, gene action refers to the functioning of genes (hereditary units) in determining [...]