en una veterinaria hay tres tipos de gatos: uno de color blanco (bb) y de pelo liso (cc), otro de color negro(BB) y de pelo liso(cc) y uno de color negro (Bb) y de pelo crespo (CC). estos dos caracteres fenotipos en los gaton siguen las leyes de mendel. de maneraque si se hace un cruce monohodribo entre lineas puras parentales homocigotas(P) y luego un cruce dihibrido entre organismos de la descendencia (F1) que genotipos se obtendran

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By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.