Question

Four inbreed lines of maize are crossed. The cross is a

• A. Tetraploid cross
• B. Double cross
• C. Dihybrid cross
• D. Tetrahybrid cross

Answer 1

The correct option is B Double cross

Double cross is a cross between $F_1$ hybrids of two different single crosses. E.g., inbred lines A and B made one cross, lines C and D another. Then AB and CD were crossed, and a double-cross hybrid, ABCD, was the result.

So, the correct answer is option B.