What is a gene?

Summary of "What is a Gene?"

Definition of a Gene: A Gene is a specific segment of DNA composed of sequences of nucleotides (A, C, T, G) that codes for proteins.

Structure of DNA:

• Each human cell contains 46 strands of DNA.
• A single strand consists of millions of nucleotides.
• Humans have approximately 20,000 genes, which vary in length from about 300 to over a million nucleotides.

Function of Genes:

• Genes provide instructions for making proteins.
• Proteins interact with other chemicals in the body to create physical traits (e.g., freckles, eye pigments) and regulate functions (e.g., hormones affecting mood).

Examples of Proteins:

• Hemoglobin: Captures and releases oxygen in red blood cells.
• Pepsin: A digestive protein that breaks down food in the stomach.
• Keratin: A structural protein forming hard structures like nails and claws.

Genetic Similarities Across Species:

• Different organisms have unique genes, but the fundamental DNA code is largely conserved across life forms.
• Humans and chimpanzees share about 96% of their genetic code, while humans and fruit flies share about 50%.

Genetic Engineering:

• Scientists can transfer genes from one organism to another, allowing for the production of new traits.
• Examples of genetically engineered organisms include:
• Corn that is toxic to insects but safe for humans.
• Tomatoes that have a longer shelf life.
• Bacteria engineered to produce human insulin for diabetes treatment.

Key Points

• A Gene is a segment of DNA that codes for proteins.
• Genes are essential for the development of traits and biological functions.
• There are significant genetic similarities among different species.
• Genetic engineering allows for the modification of organisms for various purposes.

Featured Researchers/Sources

• Jon Perry (presenter of the video)