Se ha descubierto que en mamíferos y en la mosca de la fruta Drosophyla melanogaster, hay elementos cromosómicos que influyen en las características genéticas y en la determinación del sexo. Se ha evidenciado que estos componentes cromosómicos, están determinados por un par de cromosomas sexuales que para el caso de la hembra es XX y para el caso del macho es XY. Una rata con una enfermedad catastrófica M (XMXm) se cruzó con un macho normal (XmY). En la descendencia F1 de este cruce, las hembras no heredarán el genotipo:

Which of the following happen when dehydration begins to occur? the body reduces fluid output to zero polyuria is present. the body increases the release of atrial natriuretic hormone the salivary secretions decrease

8. Wolves are at the top of the wolves all but disappeared from Yellowstone. Which of the following was a likely effect of the wolves' disappearance?

The most effective regulator of blood pH is which of the following? the renal system the respiratory system the digestive system the buffer system

9. In a study of the habitat of a population of raccoons, scientists found that the number of raccoons increased where people built houses. What might the scientists conclude from this observation?

7. The European rabbit (an herbivore) was introduced to Australia in the 1800 s. It has no natural predators in the continent and breeds very quickly. Which of the following is a negative impact that resulted from the introduction of rabbits to the Australlan ecosystem?