Two different black female mice (Z and W) are crossed with the same brown male. In a number of litters female Z produced 9 black mice and 7 brown mice and female W produced 14 black mice.
What is the mechanism of inheritance of black and brown coat color in mice? What are the genotypes
of the parents?

What type of pollution does household garbage cause

Describe the two types of vascular tissue

Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.