Science: Genetic Disorders - why do they occur?

 Hi there!

Before lockdown, in Science class we were learning about Genetics and Evolution. Since we are now in lockdown, our learning is a little different. I decided I would make a post about genetic disorders. 

What is a genetic disorder?

A genetic disorder is a disease caused by mutation or change in a person's DNA sequence.

Why do genetic disorders occur? 

Genetic disorders don't just occur one way. You can actually inherit genetic disorders from your parents. Some don't show up right away when you're  born but instead appear when you are in adulthood. Most of the time, inherited genetic disorders show up when you are born. Some genetic disorders people inherit from their parents are: 

- Huntington's Disease 

- Cystic Fibrosis 

- Haemophilia

Some genetic disorders can occur because of errors in DNA replication, or environmental factors like: radiation exposure, cigarette smoke, some chemicals and ultra violet rays. These factors can cause changes in the sequence of DNA, the mutations can then lead to genetic disorders. 

A human's genome, or complete set of genetic instructions is like a recipe book. However, unlike a recipe book, our genome can change. The changes can affect the bases in DNA (adenine, guanine, cytosine and thymine) or a chunk of DNA. Sometimes it can even affect chromosomes too.

Our DNA provides special codes to make protein or large molecules made from amino acids. These molecules are mostly responsible for controlling functions in our bodies. But, when a part of our DNA is changed, it can alter the protein code it makes too. This means the protein is affected and can sometimes stop functioning. 

Depending on where the mutations happen, they have little to no effect on the person, or they can greatly alter the makeup of cells in our body, leading to a genetic disorder.

Thanks for reading!