What proportion of chromosomes in a human skin cell are paternal chromosomes?

Half, because the ovum from the mother and the sperm from the father fuse together to form the zygote which will develop into the new human being, and the ovum and sperm, being gametes, each have half the number of chromosomes that you usually find in somatic cells (any other cell in the body that is not a gamete).

No because the eaeht is on a 23.5 degree axis tilt and so when it is winter the northern hemisphere is pointing away from the sun and the soutubern hemisphere is pointing toward the sun

When the sun hits the plant and the plant has water