Zoology - Principles of Inheritance and Variation Question with Solution | TestHub
Which of the following statement/s about test cross is/are correct?
I. Every test cross is a back cross but not every back cross is a test cross.
II. Every back cross is a test cross but not every test cross is a back cross.
III. The ratio of a test cross is always 1:1.
IV. A test cross can be considered as a type of reciprocal cross.
Options:
Answer:
Solution:
A back cross is a cross between hybrid and any homozygous parent. A test cross is a cross between hybrid and homozygous recessive parent. Thus every test cross is a back cross but not every back cross is a test cross. The Monohybrid test cross-ratio is 1:1, dihybrid test cross-ratio is 1:1:1:1, trihybrid test cross-ratio is 1:1:1:1:1:1:1:1. Reciprocal crosses are a pair of crosses in which the sex of the parents are interchanged.
