By which of the following methods, new and better varieties of plants can be formed
Selection
Grafting
Hybridization
Hybridization followed by selection
D.
Hybridization followed by selection
Hybridization and Artificial Selection. Breeders commonly use artificial selection to produce new breeds from the variable offspring of hybrid crosses. In particular, they have long used a process, known as the backcross breeding method, to obtain new types of organisms. The approach is to identify a type possessing some desirable trait and then to hybridize it with a "target stock" lacking the trait. If hybrids are obtained, the next step is to backcross them to the target stock in order to “introduce” the trait.
Root cells of wheat has 2n = 42 chromosomes. Which one of the following is the basic chromosome number of wheat?
42
21
7
14
In plant tissue culture, the callus tissues can be regenerated into complete plantlets primarily by altering the concentration of
sugars
vitamins
amino acids
hormones
Micropropagation is a technique for production of
true to type plants
haploid plant
somatic hybrids
somaclonal plants
Which one of the following poultry birds is not an english breed?
Sussex
Australorp
Orpington
Minorca
