The basic unit of heredity is the:

**The reasoning** Think of heredity like passing down family traits — your father's height, your mother's eyes. The **gene** is the smallest, most specific instruction for one trait. It's a segment of DNA that codes for a particular characteristic (like brown eyes or blood type A). Here's the hierarchy: DNA wraps into **chromosomes** (packages), which sit in the **nucleus** (the control room), all inside the **cell** (the whole house). But the actual "unit" — the single instruction that gets passed from parent to child — is the **gene**. Just like a naira is the basic unit of Nigerian currency (not your whole wallet or bank), the gene is the basic unit of heredity. **Why the wrong options tempt you** - **A) Cell** — Too big! Cells contain thousands of genes. It's like saying a school is the basic unit of learning (no, it's the lesson). - **C) Chromosome** — Still too large. One chromosome carries hundreds to thousands of genes bundled together. - **D) Nucleus** — That's just the storage room where chromosomes live, not the unit itself. **Quick takeaway** Gene = one instruction, one trait — that's your basic hereditary unit. Everything else is just packaging or storage.