Human Heredity 11th Edition by Michael Cummings

تمرين 20

In peas, straight stems ( S ) are dominant to gnarled ( s ), and round peas ( R ) are dominant to wrinkled ( r ). The following cross (a test cross) is performed: SsRr × ssrr. Determine the expected phenotypes of the progeny and what fraction of the progeny should exhibit each phenotype.