Does the shape of earths orbit affect the seasons?

Earth is closest to the sun when the northern hemisphere is in winter. So it is immediately obvious that axial tilt plays a far greater role than annual orbital distance. However, orbital cycles do account for hundred thousand year periods of ice ages known as Milankovitch Cycles.
No. The tilt of the earth's axis relative to the ecliptic plane is what causes the seasons.
No. The earth's tilt on its axis causes seasons. If the distance to the sun caused seasons, then the whole planet would experience the same seasons at the same tiime, which we know not to be the case.