Back cross and Test Cross

Back cross and Test Cross:

In Mendelian inheritance F2 offsprings are acquired by selfing the hybrid, however when the F1 hybrid is crossed to any of the pure breeding parents it is termed as back cross. When the hybrid is crossed to the dominant parent, each F2 offsprings will exhibit dominant character.

When the hybrid is crossed to recessive parent, the dominant and recessive phenotypes that appear in equivalent proportions as illustrated, that is termed as a test cross.

Monohybrid Back Cross:

791_monohybrid bak cross.jpg

Monohybrid Test Cross:

1667_monohybrid test cross.jpg

Dihybrid Test Cross:

In a dihybrid test cross the four kinds of phenotypes are acquired in equivalent proportions as illustrated. The test cross is employed to determine whether segregation of alleles has taken place and to ascertain when hybrid is heterozygous or homozygous.

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