Chronological steps in the development of hybrid
A. Development of inbreds
B. Evaluation of the hybrid with check
C. Testing for combining ability
D. Morphological evaluation of inbreds
E. Seed multiplication
Choose the correct answer from the options given below
A. Development of inbreds
B. Evaluation of the hybrid with check
C. Testing for combining ability
D. Morphological evaluation of inbreds
E. Seed multiplication
Choose the correct answer from the options given below
Show Hint
- A-C-D-B-E
- A-D-B-C-E
- A-D-C-B-E
- D-A-C-B-E
The Correct Option is C
Solution and Explanation
The question outlines the specific workflow required to produce a commercial F\( _1 \) hybrid variety. Unlike open-pollinated varieties, hybrids require the development and crossing of specific parental lines.
Step 2: Detailed Explanation:
The steps for hybrid development are:
• Development of Inbreds (A): The process begins by creating homozygous, pure lines through repeated selfing of cross-pollinated crops (e.g., Maize). This often leads to inbreeding depression but creates uniform parental material.
• Morphological Evaluation of Inbreds (D): After several generations of selfing, the inbred lines must be evaluated for their own vigor, disease resistance, and seed production traits.
Inbreds must be vigorous enough to be maintained as parents.
• Testing for Combining Ability (C): This is the most crucial stage. Not all good inbreds produce good hybrids.
Lines are tested for General Combining Ability (GCA) using top crosses and for Specific Combining Ability (SCA) using diallel or line \( \times \) tester crosses.
• Evaluation of the Hybrid with Check (B): Promising experimental hybrids (produced from parents with high SCA) are grown alongside the best existing commercial hybrids (checks).
Only those hybrids that significantly outperform the checks (heterosis) move forward.
• Seed Multiplication (E): Once a specific hybrid combination is finalized, the parental inbred lines are multiplied, and large-scale hybrid seed production is undertaken for commercial sale.
Final Answer:
The correct chronological order is A \( \rightarrow \) D \( \rightarrow \) C \( \rightarrow \) B \( \rightarrow \) E.
This matches option (C).
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• [(A).] Seeds of synthetic varieties need to be replaced every year.
• [(B).] Hybrid crops need intensive care and more inputs.
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