Crossing an individual showing the dominant phenotype with a recessive parent is called a

1. An individual showing the dominant phenotype may be homozygous or heterozygous. 2. Looking at it cannot tell you which. 3. Crossing it with the recessive parent reveals the genotype, and that is a test cross. 4. If any offspring shows the recessive phenotype, the parent must have been heterozygous. 5. This is the standard way of determining an unknown genotype. _Source: syllabus Biology Ch4 'Principles of Inheritance and Variation'_