What is 'semi- conservative' DNA replication ? How was it experimentally proved and by whom ?

Explanation

**Step-by-Step Solution:**

1. **Definition of Semi-Conservative DNA Replication:**
- Semi-conservative DNA replication is a process in which the two strands of the DNA double helix separate, and each strand serves as a template for the synthesis of a new complementary strand. After replication, each new DNA molecule consists of one original (parental) strand and one newly synthesized strand.

2. **Historical Background:**
- The concept of semi-conservative replication was proposed by James Watson and Francis Crick in 1953. They suggested that during DNA replication, the original strands of DNA separate and each serves as a template for the formation of a new strand.

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