Sweet pea flo Strains differing in X two traits, flower and poll Pollen grains grain length, are Long pollen grains White flowers Red flowers crossed short pollen gra Linkage F 2 The hybrids are one of the 连锁现象 parental strains, Red flowers indicating that red Long pollen grains flower is dominant over white and that long pollen grains is dominant over short Red flowers Red flowers White flowers White flowers Long pollen Short pollen Long pollen Short pollen grains grains grains grains 24 170 (Parental (Recombinant) (Recombinant) (Parental The frequencies of the four classes of F2 progeny deviate signifi- cantly from the Mendelian expectation of 9/16, 3/16, 3/16, and 1716, indicating that the genes controlling the trait are linkedLinkage 连锁现象