genotypic ratio multiple alleles fertility bone mass libido high testosterone low testosterone anabolic hormone male sex hormone alternative traits more than two alleles recessive characters dominant characters 9:3:3:1 phenotypic ration dihybrid ratio phenotypic ratio phenotype. genotype johan gregor mendel testosterone xxy chromosome extra chromosomes genetic condition affecting males wavy hairs intermediate offspring true breeding parents monohybrid cross non allelic allelic roan cattle blood group masked co-dominance linkages examples repulsons coupling incomplete linkage complete linkage sickle cell disease pleiotrophy examples pleiotrophy types pleiotrophy in genetics
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