Question

A cross that involves a single trait is called:

• A. Trihybrid cross
• B. Monohybrid cross
• C. Dihybrid cross
• D. Uni-cross

Answer 1

Answer: (B)

Monohybrid cross

A monohybrid cross is a cross between two parents that involves a single trait. For example, a cross of tall (TT) and dwarf (tt) pea plants involves a single trait - height.

A Dihybrid cross is a cross between two parents that involves two traits.

For example, a cross of two pea plants, one with yellow and round seeds (YYRR) and the other with green and wrinkled seeds (yyrr), involves two traits - seed shape and seed colour.

Similarly, a trihybrid cross involves the crossing of two parents that involves three traits.

There is no cross known as uni-cross.

So, the correct answer is option B.