What is backcross method in plant breeding?

backcross. A breeding method used to move one or a only a few desirable genes from an agronomically poor crop line to an elite line. This is done by crossing a donor parent to an elite line, and crossing offspring with the ‘desired gene(s)’ back to the elite parent.

What is back cross Slideshare?

What is Backcross? A cross between a hybrid (F1 or a segregating generation) and one of its parents is known as backcross. In BACKCROSS METHOD, the hybrid and the progenies in the subsequent generation are repeatedly backcrossed to one of the parents of the F1. 4.

What is back cross and its types?

backcross, the mating of a hybrid organism (offspring of genetically unlike parents) with one of its parents or with an organism genetically similar to the parent. The backcross is useful in genetics studies for isolating (separating out) certain characteristics in a related group of animals or plants.

What are the applications of backcross method?

Intervarietal transfer of qualitative characters and quantitative characters with high heritability. Interspecific transfer of traits with high heritability. To improve well established variety with respect to one or a few characters.

What is the basic requirements of backcross method of breeding?

1. Suitable recurrent parent must be available which lacks in one or two characteristics. 2. A suitable donor parent must be available, the character must be highly intense.

Why do we perform back cross?

Purpose of Back Cross It is useful for isolating (separating out) unique characteristics in a similar group of animals or plants. Since the new cultivar can be adapted to the same area as the original cultivar, the approach decreases the amount of field testing necessary.

What is backcross example?

Backcrossed hybrids are sometimes described with acronym “BC”; for example, an F1 hybrid crossed with one of its parents (or a genetically similar individual) can be termed a BC1 hybrid, and a further cross of the BC1 hybrid to the same parent (or a genetically similar individual) produces a BC2 hybrid.

What is recessive back cross?

When the desired character i.e. disease resistance is governed by a recessive gene, back crosses cannot be performed in continuation as in dominant gene transfer method. After first back cross and then after every two subsequent back crosses F2 must be raised to test rust resistance.

What is the purpose of a back cross and a test cross?

The test cross helps in the identification of the genotype of the dominant individual. The back cross helps in the identification of the elite genotype by checking the segregation of genes at the time of gamete formation.

What is back cross and test cross?

Cross between F1 generation plant to any of the parent plants is known as back cross, whereas a cross between F1 generation plant having dominant phenotype to the homozygous recessive parent is called test cross.