1-A stem cell usually becomes determined before differentiation. True or false ?
2- Recessive epistasis results in modifying the dihybrid 9:3:3:1 ratio to a 9:7 ratio in the f2 generation. T or F ?...
A woman of blood type B marries a man of blood type A. Their first child is blood type O. What is the probability that their second child will have a blood type other than O?