Have you ever wondered where you got your unique shape, your smile, your hair color, maybe even the way you talk? Sometimes we've heard, "Mom, you look just like your dad!" or "You have your mom's eyes!" That's because of these small, but very powerful things we're going to talk about today, called genes . These are what make us who we are, our appearance, even our personality.
What exactly is a gene?
Simply put, genes are a little bag of information that you get from your parents. This bag of information contains all the information that determines your 'traits' , whether your hair is straight or curly, whether you are tall or short, what color your eyes are, and how you smile. These traits are passed down from generation to generation through these genes.
Imagine, if both your mother and father have blue eyes, you are more likely to have blue eyes. Also, if your mother has freckles, you may inherit that trait too. Not only humans have these genes, animals, trees, all these living things have genes. It is said that just one cell in our body can contain between 25,000 and 35,000 genes. Isn't that amazing?
Do you know where these little genes are?
These genes are so small that we can't even see them. They are inside the tiny units called cells that make up our bodies. Your body is made up of billions of these cells. These cells are so small that you definitely need a microscope to see them.
Inside these cells, there are structures called chromosomes that look like balls of thread, or as some say, macaroni. These genes are stored inside those chromosomes. There can be hundreds, even thousands, of genes in a single chromosome. These chromosomes and genes are made up of a chemical called DNA . The full meaning of DNA is Deoxyribonucleic acid . It's a bit of a long name, isn't it? But it's easy once you get used to it.
The little powerhouse inside cells: the nucleus
In the middle of most cells, there is a small egg-shaped part called the nucleus . This is the brain of the cell. It is the nucleus that tells all the other parts of the cell what to do. So, how does the nucleus know so much? The reason is that all of our chromosomes and genes are inside this nucleus. There is more information than you might think in this little nucleus – perhaps more than in the biggest dictionary you have ever seen!
The story of our chromosomes
Every human cell has 46 chromosomes. But these come in pairs. That is, 23 pairs of chromosomes . Remember, we get one half of these pairs, that is, chromosome 23, from our mother, and the other half, chromosome 23, from our father.
When viewed under a microscope, these chromosomes appear to be of different lengths and with different patterns of stripes. When arranged in order of size and pattern, the first 22 pairs are called autosomes . The last pair are the sex chromosomes , which are the X and Y chromosomes. These sex chromosomes determine whether you are a girl or a boy. Girls have two X chromosomes (XX), and boys have one X chromosome and one Y chromosome (XY).
But not all living things have 46 chromosomes in their cells. For example, a fruit fly cell has only four chromosomes!
How do genes work?
Each gene has a specific job to do. The DNA in a gene, like a recipe, contains a set of specific instructions. These instructions are used to make proteins inside cells. Proteins are the building blocks of everything in our bodies. Our bones, teeth, hair, ears, muscles, and blood are all made of proteins. These proteins help our bodies grow and stay healthy. Scientists now believe that a single gene can make about 10 different types of proteins! That's more than 300,000 proteins!
How genes determine our traits
Like chromosomes, genes come in pairs. Both of your parents have two copies of each of their genes. But you only get one copy of each. Your genes are made up of one from your mother and one from your father. The genes you get in this way determine many of your characteristics, such as your hair color and skin tone.
Imagine that Sandani's mother has a gene for brown hair and a gene for red hair. She gave Sandani the gene for red hair. If Sandani's father has two genes for red hair, Sandani can also get a gene for red hair from him. Then Sandani gets the gene for red hair from both parents, and her hair will be red. Do you understand?
As another example, there are different types of dogs. They all have genes that make them dogs, not cats, fish, or humans. But the genes that make them dogs determine their individual characteristics. That's why some dogs are small, some are large. Some have long hair, some have short hair. Dalmatians have genes for white hair and black spots. Toy poodles have genes for curly hair. I think you understand this now.
What if there are problems with genes?
Scientists continue to study these genes. They want to know what proteins each gene makes, and what happens to those proteins. They also want to know what diseases are caused by genes that don’t work properly. We call genes that have changed in some way mutations . Researchers believe that these gene mutations are partly responsible for lung diseases, cancer, and many other diseases. Some diseases and health problems occur when genes are missing or when there are extra parts of genes or chromosomes.
Some of these gene problems can be inherited from parents to children. For example, let's take the gene that helps our body make hemoglobin . Hemoglobin is a very important protein that helps red blood cells carry oxygen throughout the body. If a child inherits a different hemoglobin gene from a parent, that child may only be able to make a type of hemoglobin that doesn't work properly. This can cause a condition called anemia . Anemia is a decrease in the number of healthy red blood cells. Sickle cell anemia is a type of anemia that is inherited from parents to children through genes in this way.
Cystic fibrosis, or CF, is another inherited disease that some children inherit. Parents who have a mutated CF gene can pass it on to their children. People with CF have trouble breathing because their bodies produce too much mucus – the thick fluid that comes out of our noses when we are sick – and it gets stuck in their lungs. People with CF need to take treatment throughout their lives to keep their lungs as healthy as possible.
Latest news: Let's learn a little about gene therapy.
Gene therapy is a very new form of medicine – so new that scientists are still in the early stages of research to see if it will work. It involves using genetic engineering to treat a disease caused by a gene that has changed in some way. One method currently being tested is to replace the diseased gene with a healthy gene. It is hoped that gene therapy research (including research in humans) will lead to new ways to treat and perhaps even prevent many diseases in the future.
So, what are the things we should remember from this story? (Take-Home Message)
So, you probably understand now that genes are the amazing and very important things that make us who we are, that affect our appearance, our personality, and even our health . They are like the most precious gift we receive from our parents.
- Genes are a set of instructions found within the cells of our body that determine our characteristics.
- These are stored in structures called chromosomes and are made up of DNA.
- We get our genes from our parents, which is why we resemble them.
- Sometimes changes (mutations) in genes can cause health problems.
- New technologies such as gene therapy may provide solutions to such problems in the future.
I hope that learning about these genes will help you better understand our bodies and our genes. If you have any further questions, don't hesitate to ask a doctor or someone knowledgeable about this subject.
` Gene, Chromosomes, DNA, Heredity, Health
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