Question

Choose the correct option for the given statements.
Statement I: Test cross is used to determine an unknown genotype within one breeding generation.
Statement II: Test cross is a cross between $F_1$ hybrid and dominant parent.

• A. Both statements I and II are correct.
• B. Statement I is correct but statement II is incorrect.
• C. Statement I is incorrect but statement II is correct.
• D. Both statements I and II are incorrect.

Answer 1

Answer: (B)

In order to determine the genotype of a tall plant of F₂ generation. Mendel crossed this plant with a dwarf plant. He named this cross as test cross. In a test cross, an individual having unknown genotype is crossed with a recessive individual. The progenies formed can be easily analysed to predict the genotype of the test organism. Test cross ratio for monohybrid cross is $1:1$ where as for a dihybrid cross it is $1:1:1:1$ .