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Uploaded byGauravrajsinh Vaghela
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Complementation test

This document presents information on complementation tests. It defines complementation tests as a method used to determine if two mutations are in the same gene or different genes. It explains that if the mutations are complementary (in different genes), the offspring will show the parental phenotypes, but if they are not complementary (in the same gene), the offspring will show a new phenotype. Three examples of using complementation test results to determine the number of genes involved are provided. The document concludes by citing a reference for more information on assigning mutations to genes using complementation tests.

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A Presentation on Complementation Test Presented by: Presented to: Vaghela Gauravrajsinh K. M.Sc. (Agri.) Reg.no.-04-AGRMA-01840-18 SDAU ,S. K. Nagar. Mr. Manish Sharma Asst. Res. Scientist, Pulse Research Station, SDAU ,S. K. Nagar.
COMPLEMENTATION TEST  Term given by Seymour Benzer.  It is used to detect two mutants are in same gene or not.  Two different mutation or gene of interest occur in same chromosome/ gene or not that can be studied with the help of complementation test.  Its name saying that it’s complementary to each other.  If genes are complement with each other that means gene present in different chromosome or gene.  If it is not complement that means gene present in same chromosome.
When the two mutations are on the same chromosome, the arrangement is called the coupling or cis configuration, and a heterozygote with this genotype is called a cis heterozygote. When the two mutations are on different chromosomes, the arrangement is called the repulsion or trans configuration. An organism with this genotype is a trans heterozygote.
EYE COLOUR OF DROSOPHILLA A pigment B pigment White White Red Present Present  If there is Red eye colour of drosophila, so we can say that both A and B pigment is present.  If there is White eye colour of drosophila, so we can say that either A or B pigment is absent.  So we can say that A and B pigment are complementary to each other.
PARENT A aaBB aaBB aaBB (WHITE) PARENT B AAbb AAbb AAbb (WHITE) aaBB AAbb AaBb (RED)  For Complementation test, Homozygous recessive mutational parents required because only mutation see when parent are Homozygous recessive.
EXAMPLE:- 1 How many genes are present? Strain 1 2 3 4 5 1 - + - + - 2 - + + + 3 - + - 4 - + 5 - Number of Genes:- 3 Gene 1:- Contain strain (1,3,5) Gene 2:- Contain strain 2 Gene 3:- Contain strain 4
EXAMPLE:- 2 In drosophila, recessive mutants a, b, c, d, e, f & g all have the same phenotype, namely the absence of red pigment in the eyes (So the eyes are white). In pairwise combinations in complementation tests, the following results were produced (‘+’= Complementation, ‘-’= No Complementation) Strain A B C D E F G G + - + + + + - F - + + - + - E + + - + - D - + + - C + + - B + - A - Number of Genes:- 3 Gene 1:- Contain strain (G, B) Gene 2:- Contain strain (A, F, D) Gene 3:- Contain strain (C, E)
1 2 3 4 5 6 7 - + + + + - - 1 - + + - + + 2 - - + + + 3 - + + + 4 - + + 5 - - 6 - 7 EXAMPLE:- 3 Seven arginine requiring mutants of E. coli were independently isolated. All pairwise mating’s were done to determine the number of complementation groups involved. If a (+) in the following table indicates growth and a (-) indicates no growth, so how many complementation groups are involved? Number of Complementation Group or Gene present:- 3 Gene 1:- Contain strain (1, 6, 7) Gene 2:- Contain strain (2, 5) Gene 3:- Contain strain (3, 4)
Reference Snustad, D. P. and Simmons, M. J. (2012). Assigning Mutations to Genes by the Complementation Test. Principals of Genetics. (6th Edition). pp. 342-346.