total collection of all diverse alleles of all genes
various combinations causing change on the frequency of alleles
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The Correct Option isC
Solution and Explanation
Step 1: Understanding the Concept
Plant breeding begins by collecting the existing genetic variability of a crop.
Step 2: What is collected
This includes cultivated varieties, wild relatives and local types of the crop.
Step 3: Meaning
The full collection of plants or seeds that carries all the diverse alleles of all genes is the germplasm collection. It supplies the raw material for selection.
Final Answer:
Germplasm collection means the total collection of all diverse alleles of all genes of a crop.
\[ \boxed{\text{(C) }\text{total collection of all diverse alleles of all genes}} \]