Discuss the mechanism of attribute/relationship inheritance. why is it useful?

Attribute / relationship inheritance is when characteristics of DNA are passed on to offspring or the next generation. Not all attributes are visible or expressed and yet can still be passed on generationally. Sometimes hese characteristics might seem inocuous like red hair or green eyes, but other certainly serve a purpose. A good example can be the amount of melanin in a person's skin. Heavy pigmentation will limit the skin's exposure to ultraviolet rays from sun light, certainly an important trait for people living closer to the equator while less melanin means more efficient absorption of sunlight in areas where there is very little sun light, like placescloser to the Earth's poles.