Inbred strains (also called inbred lines, or for animals linear animals) are individuals of a particular species which are nearly identical to each other in genotype due to long inbreeding.
Freebase(3.00 / 2 votes)Rate this definition: Sunlight. Sunlight is a portion of the electromagnetic radiation given off by the Sun, particularly infrared, visible, and ultraviolet light. On Earth, sunlight is filtered through the Earth's atmosphere, and is obvious as daylight when the Sun is above the horizon.
Radiation is the final form of movement of heat energy. The sun's light and heat cannot reach us by conduction or convection because space is almost completely empty. There is nothing to transfer the energy from the sun to the earth. The sun's rays travel in straight lines called heat rays. When it moves that way, it is called radiation.