Answer:
Your DNA is responsible for who you are, how you act and even how you look. It is an instruction manual; only that instructions are in the form of genes. Each gene contains specific information that makes up a part of you. A good example is your hair color, which is determined by a single gene that contains instructions about it. In some cases, a couple of genes have to work together to bring out one trait. Each gene has its own contribution to the characteristic. For example, the color of your eyes is determined by eye color genes. You might have each gene from each parent. Therefore, you have 2 copies of most of the genes you have. In this way, you have 2 copies of your eye color genes. However, not all gene copies are the same. This is the reason why we have variety. Not all gene versions are made equal. There are those that are stronger than others. The stronger versions are referred to as dominant while the weaker ones are called recessive. For this reason, the dominant versions will always win over the weaker ones.
For better understanding, let’s say “T” represents the tall height allele and “t” represents dwarfism allele. Following this, the tall height gene will be “TT” that is 2 copies of a similar allele or “Tt” that is a copy of each allele. The gene for dwarfism will then be “tt” that is 2 copies of the same allele.
For example, a tall father with “TT” genes and a dwarf mother with “tt” genes will have a tall offspring with “Tt” genes.