What is single and double cross hybridization?

double-cross hybrid. the type of hybrid that is produced when two different single-cross hybrids are cross-pollinated. . As the name implies, producing a double-cross hybrid requires two stages of crossing involving two pairs of inbreds (see diagram below).

What is single cross method?

Single Cross Method. In this method, crosses involve two inbred lines and the resulting F1 hybrids are evaluated. This technique came into existence only when in 1909, Shull suggested the inbred lines as parents for production of F1 hybrids.

What are the uses of single crosses in plant breeding?

The single-cross parents are chosen on the basis of combining ability tests. The cross between two single crosses is made so that seed of uniform size may be harvested from a vigorous F 1 plant, thereby facilitating the production of hybrid seed and reducing the cost of the seed to the farmer.

What is Double cross method?

The double cross was the basic technique used in developing modern hybrid maize and has been used by commercial firms since. Jones’s invention was to use four inbred lines instead of two in crossing. Simply, inbred lines A and B made one cross, lines C and…

What is top cross?

: a cross between a superior or purebred male and inferior female stock to improve the average quality of the progeny also : the product of such a cross.

What is Double cross in genetics?

n. (Genetics) a technique for producing hybrid stock, esp seed for cereal crops, by crossing the hybrids between two different pairs of inbred lines.

What is top cross method?

Production of Top-Cross Seed: This scheme is also known as inbred-variety cross, (Inbred x Variety), i.e., inbred line is crossed with an open pollinated variety. Also the cross between a single cross and with another inbred is known as double top cross or 3 ways cross.

How many single crosses can be made in all possible combinations?

All Answers (6) You will have totally 380 crosses for 20 lines in all combinations.

What is multiline variety?

The term Multiline Genetics is used for a variety is a composite of genetically identical lines, except that each line possesses a different gene for resistance to the disease. This is also called Multiline Varieties. In the event of occurrence of a new race, some plants may be susceptible, but not all.

What are top cross and Polycross method?

In principle, the topcross, like the diallel cross or the polycross, is a test cross, but whereas the aini of the polycross is to test for general com- bining ability alone, and that of the diallel cross, besides giving more detailed information on the inheritance of the character selected for, is to test for both …

What is back cross and test cross?

Back cross. Breeding of the dominant phenotype with the homozygous recessive phenotype (parent) is known as a test cross. The breeding of F1 generation with one of its parent plants is known as a back cross. All test crosses are backcrosses. A backcross can be said as a test cross if the parent is recessive.

What kind of hybrid is a single cross?

The hybrid progeny between a single cross and an inbred lines is referred to as three way cross hybrid. Such hybrids are sometimes used in maize. The single cross is used as female and inbred as male, viz. (A x B) x C. Main features of three way cross hybrids are given below: i.

What are the different types of interspecific hybrids?

These types of hybrids are commonly used for commercial cultivation in several cross pollinated crops and some self-pollinated crops. Intraspecific hybrids are always fertile. Based on type of cross, intraspecific hybrids are of three types, viz.: (a) Single cross hybrid, (b) Three way cross hybrid, and (c) Double cross hybrid.

How are cross pollinated plants different from self pollinated hybrids?

In cross pollinated species, such hybrids are developed from a cross between two inbreds (viz. A x B), whereas in self-pollinated species they are developed from a cross between two homozygous varieties. Main features of single cross hybrids are given below:

What is the aim of a hybridization process?

The aim of hybridization may be transfer of one or few qualitative characters, improvement of one or more quantitative characters, or use of the F 1 as a hybrid variety. The transfer of one or more characters from other varieties into a single variety is known as combination breeding.

What is single and double cross hybridization? double-cross hybrid. the type of hybrid that is produced when two different single-cross hybrids are cross-pollinated. . As the name implies, producing a double-cross hybrid requires two stages of crossing involving two pairs of inbreds (see diagram below). What is single cross method? Single Cross Method. In this…