Genetic Linkage: Types, Theories, and Significance
Explore the concept of genetic linkage, which refers to the tendency of genes on the same chromosome to be inherited together. Learn about complete and incomplete linkage, related theories, and the significance of genetic linkage in inheritance patterns.
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Presentation Transcript
LINKAGE LINKAGE PRESENTED BY KAVITA PRAJAPATI
SYNOPSIS: SYNOPSIS:- - INTRODUCATION DEFINATION KINDS OF LINKAGE COMPLETE LINKAGE INCOMPLETE LINKAGE THEORIES RELATED TO LINKAGE SIGNIFICATICANCE OF LINKAGE CANCLUSION REFERENCE:- DR S.M. SAXSENA IN BHOPAL DR. P.K. DHAKA
INTRODUCATION : INTRODUCATION :- - Tendency of genes to remain together in their original combination during inheritance is called linkage The phenomenon of linkage was firstly reported by Bateson and Punnet in 1906. ... And all genes located in same chrGenetic linkage is the tendency of DNA sequences that are close together on a chromosome to be inherited together during the meiosis phase of sexual reproduction. Two genetic markers that are physically near to each other are unlikely to be separated onto different chromatids during chromosomal crossover, and are therefore said to be more linked than markers that are far apart. In other words, the nearer two genes are on a chromosome, the lower the chance of recombination between them, and the more likely they are to be inherited together. Markers on different chromosomes are perfectly unlinked.omosome would move to same pole during cell division.
DEFINATION : DEFINATION :- - the relationship between genes on the same chromosome that causes them to be inherited together
KINDS OF LINKAGE : KINDS OF LINKAGE :- -
THEORIES RELETED TO LINKAGE THEORIES RELETED TO LINKAGE The Chromosomal Theory of inheritance, proposed by Sutton and Boveri, states that chromosomes are the vehicles of genetic heredity. Neither Mendelian genetics nor gene linkage is perfectly accurate; instead, chromosome behavior involves segregation, independent assortment, and occasionally, linkage. Bateson, Saunders, and Punnett decided to cross the F1plants with each other. After this cross, the researchers expected the F2generation to have a 9:3:3:1 ratio (nine plants with purple flowers and long pollen grains, to three plants with purple flowers and round pollen grains, to three plants with red flowers and long pollen grains, to one plant with red flowers and round pollen grains). Instead, they observed the results shown in Table 1 (Bateson et al., 1905), and these results were found to be statistically significant with a chi-square (c2) value of 969.
