Why is it possible for a person with type negativo blood to receive biood from a person with type positive blood only once?

Each trait of a plant is determined a. an allele b. one gene c. a pair of genes d. one dominant gene

Which represents the cross between parent plants if one is heterozygous for yellow-colored pods and the other is homozygous for green-colored pods? yy  ´    ´    ´    ´  yy

Describe the relationship between isotonic solutions, equilibrium, and water movement into and out of a cell.