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    Home > Biochemistry News > Biotechnology News > Hybrid mode (pattern of crossing)

    Hybrid mode (pattern of crossing)

    • Last Update: 2021-03-01
    • Source: Internet
    • Author: User
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    number of parents is different, using different ways to make hybrid combinations. The significance of hybridization is to create a mutant group that meets the breeding objectives, plus the possibility that the general election will be expected to recombine (combination). Commonly used there are single, three, double, return and other ways. With more than two parent traffic called multi-intersection or compound hybridization.single-handed A/B (/for first hybridization), two parents cross-breed once, also known as pair hybridization, is the simplest way to cross-breed. Singles have ortho and reverses. A/B is orthosecting, then B/A is inverse, and vice versa.Thry-crossed A/B//C or A//B/C (// represents second hybridization), it is generally necessary to enable a third parent when the two parents do not have all the features required by the breeding target and are configured as a triple cross combination. A better yield parent with a comprehensive form should be used as a second hybrid parent.doubles Typical doubles include four parents, A/B/C/D. Double intercourse can concentrate more target symptoms into a group and apply them when breeding targets require more sex. The similarity between three parents A/C//B/C and three-crossed is that the genetic dose of three parents A, B and C is theoretically the same as that of the typical triple cross, and the difference between the individuals in the three-parent double-crossed F1 group is longer than that of the typical triple F1 group, which is more conducive to choice.-order hybridization is a compound hybrid that constantly references new parents, such as A/B//C/B/3/D/4/E... (The number in // represents the first hybridization) with the aim of continuing to correct the shortcomings of the made combination. Each parent is required to have a high level of comprehensiveness, otherwise it is not easy to receive the desired effect.Compound hybridization from the F1 generation, that is, the separation of the symptoms, it is appropriate to start from the F1 generation, rather than from the F2 generation as a single cross, because of the more nature involved, a wide range of variations, its F1 generation group must maintain a certain scale, in order to be able to select the required offspring, so more hybrid rice. The selection intensity should be reasonably mastered according to the explicit and implicit relationship of the separation of the nature, and more single strains can generally be selected appropriately, and the selected single-plant descendant groups need to be expanded appropriately. Compared with single-intersection, the re-intersection offspring group has a wide range and variety of variations, and it is possible to select recombinants with more target characteristics. In the third or more hybridization, one or both parents are separated, requiring a more accurate selection of good single strains for hybridization.
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