Multiple choice

A cross between a hybrid and a ressive parent, and a cross between a hybrid and a pure breeding parent are known as

  1. monohybrid crosses

  2. test cross and back cross respectively

  3. dihybrid cross and back cross respectively

  4. back cross and test cross respectively
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A test cross involves crossing a hybrid (heterozygous) with a recessive (homozygous recessive) parent to determine the hybrid's genotype. A back cross involves crossing a hybrid with a pure breeding (homozygous) parent - which could be either dominant or recessive. Therefore, hybrid × recessive = test cross, and hybrid × pure breeding = back cross. Note that back cross is broader - test cross is a specific type of back cross.

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