2举例 homozygous homozygous dominant parent recessive parent Dominant Recessive Dominant-to- Studied Form Recessive seed 5.474 round 1. 850 wrinkled 2.96:1 duplicated before meiosis) 6.022 yellow 2,001 green 301:1 meIosis sha 882 inflated 299 rink color meIosis 428 green 152 yellow 2.82:1 flower (gametes (gametes) 705 purple 224 white 3.15:1 O fertilization produces heterozygous flower offspring 651 along stem Figure 11. 4 A monohybrid cross, showing how one gene of a pair 207 at tip 3.14:1 segregates from the other Two parents that breed true for two different versions of a trait can produce only heterozygous offspring Figure 11.5 (Right) Results from Mendel's monohybrid cross experiments with the garden pea plant (P sativum). The stem numbers given are his counts of the F2 plants that carried dominant or recessive hereditary "units"(alleles) for the trait 2.84:1 On average, the dominant-to-recessive ratio was 3:1.a 787 tall 27 77 dwarf Average ratio for all traits studied 3:12.举例