Human DNA is 99.9% identical from person to person. Although 0.1% difference doesn't sound like a lot, it actually represents millions of different locations within the genome where variation can occur, equating to a breathtakingly large number of potentially unique DNA sequences. The information in DNA is stored as a code made up of four chemical bases: adenine (A), guanine (G), cytosine (C), and thymine (T). Human DNA consists of about 3 billion bases, and more than 99 percent of those bases are the same in all people.
![image](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2Fa80b7763-6aa5-4dcd-84fc-d4a19d07aa25%2FScreen_Shot_2022-01-18_at_12.33.12_PM.png?id=c62acfff-4f7d-46cd-a35c-35fb915b6a1b&table=block)
![image](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2F6c57b893-bffc-4723-8274-39d863dd9c94%2F7f64b0a0cacbdad819a1922606271998.jpeg?id=4175708e-5b78-4212-b0ec-a3661f090af2&table=block)
![image](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2F2c3cd74b-308e-4f13-a0d7-f6ad993cbf23%2FScreen_Shot_2022-01-18_at_12.12.14_PM.png?id=c0df1208-5397-43a4-b836-a62b8f71c48f&table=block)
![image](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2F2b18a37c-841e-4bc7-866e-f51cb5ac410f%2FScreen_Shot_2022-01-18_at_12.13.11_PM.png?id=6c26ba87-38c7-4fa4-b970-eb1b45fde419&table=block)
![image](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2Fbe7c15bb-9183-49c5-8d1c-0a6d61073223%2FScreen_Shot_2022-01-18_at_12.37.57_PM.png?id=f73d5bca-8e52-4257-b9b5-ab75fba427cd&table=block)
![image](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2F42a59b66-b922-4017-bcb6-0e9c92b8ab5e%2FScreen_Shot_2022-01-18_at_1.45.37_PM.png?id=92fd9aba-18c1-43f1-a72e-1520a3e67bcd&table=block)
Zygote Fertilized egg cell that results from the union of a female gamete (egg, or ovum) with a male gamete (sperm).
![image](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2F3ecce490-55a5-493b-a24c-311bf570d792%2FScreen_Shot_2022-04-09_at_2.15.52_AM.png?id=202b942d-ef4f-4605-99a4-e49a41a93f29&table=block)
![image](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2F61a42b2c-9bc9-4d33-a115-d8e57a35482b%2FScreen_Shot_2022-01-18_at_12.45.05_PM.png?id=cf3ef499-2644-491d-98de-06d677e09534&table=block)
![image](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2F1b8b1220-10e2-4cb0-88c2-db1fef594efb%2FScreen_Shot_2022-01-18_at_12.55.59_PM.png?id=f71c2a3a-2fce-4aeb-8958-a8a9c1e0b946&table=block)
![image](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2F2111e2cd-0936-4fec-8b96-e9782eeae470%2FScreen_Shot_2022-01-18_at_12.21.37_PM.png?id=1d41016e-d50f-432f-b4c4-b593e1f1d195&table=block)
![image](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2F14cf3bef-7f24-412b-ba6c-77209073a050%2FScreen_Shot_2022-01-18_at_12.34.49_PM.png?id=b35bb396-8be7-4596-8e62-04c55eaff962&table=block)
![image](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2Fba6018af-1745-4a71-a5c4-b25dd3d0d7a0%2FScreen_Shot_2022-01-18_at_12.15.33_PM.png?id=6d1a7182-9232-47c6-a19b-e7629cd0922f&table=block)
![image](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2F51e3542b-d982-4928-940e-2a9d8333d4f8%2FMetabolism_pathways_(partly_labeled).svg.png?id=206dac4d-5fb7-4c94-b4fb-5b63470538b9&table=block)
![image](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2F0e4850d8-fa6e-428e-acda-88bf1d3d9895%2FScreen_Shot_2022-01-18_at_12.14.34_PM.png?id=7223c856-d85c-47f6-9fe0-eae637967540&table=block)