MAPPING by 3-POINT TEST CROSS

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Presentation transcript:

MAPPING by 3-POINT TEST CROSS

By: ARSH DIXIT Roll no – 626/14

MAPPING To Find the Order and Distance between the GENES.

3-POINT TEST CROSS Cross between 3 Genes (Point ) be detected ,instead of 2-Point Test Cross Double Cross Over (D.C.O.) between 3-Point Test Cross determined the position of CENTRAL LOCII change.

IDENTIFICATION (Progeny) PARENTAL Genotype: Maximum Progeny SINGLE CROSS OVER Genotype: Intermediate No. of Progeny DOUBLE CROSS OVER Genotype : Least No. of Progeny

IDENTIFICATION (ORDER of Genes) Comparison Parental Genotype & Double Cross Over Genotype i.e; Parental Genotype form recombinants (change in central locii) & Double Cross Over occurs

SINGLE CROSSING OVER

Linkage Distance=No. of recombinant progeny*100 Recombinant Distance between Locii Measured in MAP UNITS Linkage Distance=No. of recombinant progeny*100 Total Progeny