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Progeny of a cross made between two pure...

Progeny of a cross made between two pure parents show increased vigour and productivity. This is due to:

A

Selection

B

Hybridisation

C

Hybrid vigour

D

Mutation

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Question**: The question states that the progeny of a cross between two pure parents shows increased vigor and productivity. We need to identify the reason for this phenomenon. 2. **Identifying Key Terms**: The terms "progeny," "cross," "pure parents," "increased vigor," and "productivity" are crucial. The term "hybrid vigor" (or heterosis) is particularly important in this context. 3. **Defining Hybrid Vigor**: Hybrid vigor refers to the improved or increased function of any biological quality in a hybrid offspring. It is the tendency of crossbred individuals to exhibit qualities superior to those of both parents. 4. **Mechanism of Hybrid Vigor**: When two different pure breeds are crossed, the resulting hybrid often shows enhanced traits such as growth rate, yield, resistance to diseases, and overall productivity. This is because the hybrid inherits a combination of advantageous traits from both parent lines. 5. **Conclusion**: The increased vigor and productivity in the progeny from the cross of two pure parents is due to hybrid vigor. **Final Answer**: The increased vigor and productivity in the progeny of a cross made between two pure parents is due to hybrid vigor. ---
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