In dihybrid cross white eyes yellow body female drosophila cross with red eye brown body male drosophila produced in FRONT generation 1.3%free combining and 98.7 percent progeny with parental type this observation of magon developed from mendelian F2 phenotypic dihybrid ratio.
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IT IS DUE TO PHENOMENON OF LINKAGE.
▪ Linkage is definedas the phenomenon in which two or more linked genes are inherited together and their frequency of recombination in a test cross progeny is less than the excepted 50%.
▪ In the case the gene for eyes colour and body colour show linkage and do not always allow for crossing over during gamete formation ; hence , the parental combination is a greater proportion than that of recombinants.
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