Why would you be able to take the dna from a human and insert it into a mouse

In the family tree below, people with the recessive trait of attached earlobes are shaded gray.

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.

How would you describe the the organisms in the second row of model 1 that are connected to the parents by a line