Psychology Glossary. Genotype. The total set of genes contained within an organisms cells. Organisms contain some genes that are expressed (you can consider the expressed to mean that the gene is active or being used) and some that are not. Regardless, all the genes an organism has are considered the genotype.
Mars' closest approach to the Earth is called opposition, and occurs roughly every 780 days.
At its closest approach, Mars is about 50 million km from Earth; at its farthest almost 402 million km (when Earth and Mars are on opposite sides of the Sun). The average distance between Earth and Mars is over 200 times as far as it is from the Earth to the Moon.