Red, curly hair runs in some families and black, straight hair in others.
Some families include many people who live into their late nineties or
beyond. Eye and hair color as well as height, longevity, and other family traits
are inherited from parents and passed on to children in a cellular material
called genes. Some diseases can also be inherited or caused by changes in
one's own genes or those of a parent. Inheritance is a characteristic of all
living things. You can actually change someone or something's genes. This is
called genetic engineering. Technically, genetic engineering is the use or
manipulation of an individual's genetic material in order to produce desired
characteristics or results in the same individual, other individuals of the same
species, or other species.
Genetics is a very complex subject, and it is difficult to understand. A
gene is the fundamental unit of heredity; one segment of DNA arranged in a
specific sequence which is passed from parent to child .
As it explains above,
heredity is when, for example, a child may have blue eyes like his/her mother
and brown hair like his/her father, and maybe he/she has the arithmetic skills
of his/her grandfather. There are many possibilities. DNA (technically
deoxyribonucleic acid) is the molecular basis of heredity for living organisms.
It is a chemical molecule made up of base pairs that contain genetic
instructions. Each cell of every living organism contains DNA. There is also a
thing called RNA (ribonucleic acid). RNA is a chemical molecule that carries
a cell's genetic instructions from the DNA to organelles (specialized cell
bodies, such as ATP, lysosomes, etc.) that produce proteins for cell activities.
Now that we have most of that out of the way, let's get back on the subject.
You may be wondering, what is...