How many copies of the genes. for one feature are in each reproductive cell (the sperm and the egg A (0)
B (1)
C (2)
D (4)

2 copies one for the dominant trait and the other for the recessive trait

hope that helps

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.