A test cross is used to determine
- Acheck_circle
Whether an individual showing the dominant phenotype is homozygous (AA) or heterozygous (Aa) by crossing with a homozygous recessive
- B
Whether a population is in Hardy-Weinberg equilibrium by comparing observed and expected genotype frequencies
- C
Whether two genes assort independently or are linked on the same chromosome by analyzing recombinants
- D
Whether a recessive phenotype is caused by a single allele or multiple interacting genes through pedigree analysis
Explanation
Cross unknown × aa: if all offspring are dominant, parent is AA; if 1:1 ratio of dominant:recessive, parent is Aa.