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CSS Botany QUESTION #1365
Question 1
A cross between an individual with an unknown genotype and a homozygous recessive individual is called a:
  • Back cross
  • Test cross✔️
  • Monohybrid cross
  • Dihybrid cross
Correct Answer Explanation
A test cross involves crossing an organism with an unknown genotype (possibly homozygous dominant or heterozygous) with a homozygous recessive individual (e.g., aa). The phenotypic ratio of offspring reveals the unknown genotype. If all offspring show the dominant phenotype, the unknown parent is homozygous dominant; if a 1:1 ratio appears, it is heterozygous.