Kiểu gen nhân/ Kiểu gen TBC/ Kiểu hình:- rf rf / S bất dục / Phấn hư- rf rf / N hữu dục / Phấn tốt- Rf Rf hoặc Rf rf / N hữu dục / Phấn tốt- Rf Rf hoặc Rf rf / S bất dục / Phấn tốtA, B, C, D là những dòng thuầnBắp lai đơn có công thức: AxB và CxDBắp lai kép có công thức: (AxB) x (CxD)Kiểu gen của bắp lai đơn và lai kép như thế nào để khi sản xuất hạt giống khỏi phải khử đực và khi trồng sản xuất khỏi phải bổ sung phấn

Mr. j, age 42, is a construction worker in las vegas. he recently noticed that a mole on his face seemed to be getting larger and darker. at first he did not worry because he was in the sun a lot and assumed the change may have been caused by sunburn. after a month, not only was the mole larger and darker, but it appeared to be “bumpy.” his doctor diagnosed a malignant melanoma skin cancer following biopsy of the nevus. mr. j reports pain in his right shin that does not go away when he puts his feet up or sleeps. discussion questions 1. relate mr. j’s skin changes to the warning signs for malignant melanoma. (see malignant melanoma.) 2. discuss the normal progression of this malignancy. what is the significance of the bone pain that mr. j is experiencing? (see malignant melanoma.) 3. discuss the treatment available for this patient and the prognosis for recovery. (see malignant melanoma.)