XYZ system of hybrid seed production in wheat was proposed by:
The principle of the XYZ system was published by Driscoll (1972). It uses an addition chromosome carrying a gene for pollen fertility and a gene for a phenotype marker – blue coloured aleurone layer.
I. 2y² - 3y – 14 = 0
II. 3x² - 7x + 4 = 0
I. 40 x² - 93 x + 54 = 0
II. 30 y² - 61 y + 30 = 0
I. 2x2- 5x - 33 =0
II. 2y2+ 5y - 25 = 0
I. p²= ∛1331
II. 2q² - 21q + 55 = 0
I. 3x2 – 17x + 10 = 0
II. y2 – 17y + 52 = 0
I. 6x2 + 19x + 10 = 0
II. y2 + 10y + 25 = 0
I. x2 + 91 = 20x
II. 10y2 - 29y + 21 = 0
I. 10x2 + 33x + 9 = 0
II. 2y2 + 13y + 21 = 0
A and B are the roots of equation x2 - 13x + k = 0. If A - B = 5, what is the value of k?
I. x2 – 12x + 32 = 0
II. y2 + y - 20 = 0
