What is a back cross in genetics?
Backcrossing. A breeding method used to move one or 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 method of breeding?
Backcross breeding enables breeders to transfer a desired trait such as a transgene from one variety (donor parent, DP) into the favored genetic background of another (recurrent parent, RP). If the trait of interest is produced by a dominant gene, this process involves four rounds of backcrossing within seven seasons.
Why back cross is done?
Purpose of Back Cross: Backcross breeding can be done over and over again. The same backcrossed cultivar can be recovered if the same parents are used. It can be used to insert unique genes into massive crosses. It can be used to breed self-pollinated and cross-pollinated plants.
What is Back cross in biology?
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 is back cross explain?
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. In animal breeding, a backcross is often called a topcross.
How do you do a backcross?
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. The parent to which successive backcrosses are made in backcross breeding.
What is back cross Class 10?
Answer: Backcrossing is a crossing of a hybrid with one of its parents, or an adult genetically identical to the parent, to achieve offspring with a genetic identity closer to the parents. It is used in horticulture, animal breeding, and gene knockout organism development.
What is back Cross Class 10?
How does a back cross and a test cross work?
The phenotypes of the offspring produced by a test cross reveal the number of different gametes formed by the parental genotype under test. (a) When impure dominant (Cc) is crossed with the pure recessive. In this cross 50% plants will be red and 50% will be white B. (Backcross is a test cross also)
What is the meaning of the word backcross?
: to cross (a first-generation hybrid) with one of the parental types. backcross. noun. Definition of backcross (Entry 2 of 2) : a mating that involves backcrossing also : an individual produced by backcrossing.
Which is an example of a back crossing?
The cross between first filial heterozygote tall (Tt) pea plant and pure tall (TT) or pure dwarf (tt) pea plant of the parental generation is also an example for the back-crossing between two plants.
When is a f 1 cross called a back cross?
Test cross is a simple method devised by Mendel to verify the genotype of the F 1 hybrid. When the F 1 hybrid is crossed with the homozygous recessive parent, it is called a test cross. Since, the F 1 is crossed back with one of the parents, it is also called a back cross.