Back cross, Biology

BACK CROSS

When F1 individual (Tt) is crossed with one of the two parents, either tall (TT) or dwarf (tt), such a cross is called the back cross. There are two possibilities in such a cross : -

(i)         When F1 (Tt) is crossed with the dominant homozygous (TT) parent, the plants produce will be 100% tall.

(ii)         If F1 (Tt) is crossed with recessive homozygous (tt), 50% plants will be tall and 50% dwarf.

Uses of a Back Cross

Back crosses are used by plant breeders to rapidly improve a variety by making a useful trait (gene) homozygous, that is pure.

Posted Date: 10/10/2012 4:00:46 AM | Location : United States







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