Question

The ratio 1 1 1 1 is expected as a result of

• A. monohybrid cross
• B. monohybrid back cross
• C. dihybrid cross
• D. dihybrid test cross.

Answer 1

Answer: (D)

: Dihybrid test cross is obtained when dihybrid $F_1$ plant is crossed with its recessive parent considering in two characters. By this cross the heterozygocity and homozygocity of the organisms can be tested.
Then, dihybrid test cross ratio is $1:1:1:1$ . Likewise, monohybrid and trihybrid test cross ratio are $1:1$ and $1:1:1:1:1:1:1:1$ respectively.