1、一对相对性状的杂交试验 红花与白花 True-breeding parent (homozygous F Fa plant recessive) PHENOTYPES PHENOTYPES alleles True-breeding segregate parent homozygous dominant) a plant Aa Aa AA Aa A-A Aa Aa 4 Aa aa alleles segregate红花与白花 1、一对相对性状的杂交试验