5.ay一sachs disease(GM gangliosidosis), which is transmitted as autosomal recessivetrait, is rare in China, Two cases of Tay一Sachs disease were diagnosed and treated in PUMC hospital during the past 7 vears.
6.Any of several hereditary blood-coagulation disorders in which the blood fails to clot normally because of a deficiency or an abnormality of one of the clotting factors. Hemophilia, a recessivetrait associated with the X-chromosome, is manifested almost exclusively in males.
8.Dominant means that one gene in the gene pair is able to control the trait which that gene pair codes for, recessive means that both genes in the gene pair are necessary to control the trait.
9.Ratios of 15 green: 1 zebra were observed in F_2 generation of Wujin4B×Zhenshan97B and Wujin4B×Mian51B, indicated that zebra-leaf trait was controlled by two pairs of recessive loci.
10.In this study, genetic analysis for the flag leaf roll was carried out in F1 plants and a doubled haploid (DH) population derived from the inter-subspecific cross between ZYQ8 and JX17. The results show that the flag leaf roll trait is controlled by two recessive genes.
