Answer for Day 1 - 2️⃣ Every cell in your body has the exact same DNA. Which is *false*. 1. During development or over a person’s lifetime, *somatic mutations* can lead to genetic variation between cells. Cells like neurons acquire these mutations. 2. Immune cells (B and T cells) rearrange their DNA to make a huge variety of receptors to recognize different pathogens in a process called *V(D)J recombination*. 3. Egg and sperm cells have literally *half* the DNA. 4. RBCs have *no DNA*.