Alternate row and column background and foreground colors

Obs Name Sex Age Height Weight
1 Joyce F 11 51.3 50.5
2 Thomas M 11 57.5 85.0
3 Jane F 12 59.8 84.5
4 Louise F 12 56.3 77.0
5 James M 12 57.3 83.0
6 John M 12 59.0 99.5
7 Robert M 12 64.8 128.0
8 Alice F 13 56.5 84.0
9 Barbara F 13 65.3 98.0
10 Jeffrey M 13 62.5 84.0