Scientific knowledge has, in some cases, led to a. decreased life expectancy b. a decrease in the gap between developed and developing countries c. a better quality of life d. all of the above

Cattle with brown fur and cattle with white fur will produce a reddish roan calf . when examined closely, the calf show about an even number of brown hairs and white hairs that give a reddish appearance when viewed from far away. the fact that both the brown fur allele and the white fur allele are expressed equally in the offspring is an example of