The term heterosis was first coined by

Options

A. McClintock
B. Boweri
C. Swaminathan
D. Shull

Answer

**Step-by-Step Solution:**

1. **Understanding Heterosis:**
- Heterosis, also known as hybrid vigor, refers to the phenomenon where the offspring (progeny) exhibit superior traits compared to their parents. This can include enhancements in size, growth rate, fertility, and overall yield.

2. **Application of Heterosis:**
- Plant and animal breeders utilize heterosis by crossing two different purebred lines that possess desirable traits. The resulting hybrids often exhibit improved characteristics, making them more advantageous than either parent.

3. **Identifying the Origin of the Term:**
- The term "heterosis" was first introduced by a scientist named Schull.

4. **Year of Coinage:**
- Schull coined the term "heterosis" in the year 1940.

5. **Final Statement:**
- Therefore, the answer to the question is that the term heterosis was first coined by Schull in 1940.

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