Subtopic: Fundamentals of Biomolecules, enzyme kinetics
Question Statement:
A dioecious plant has XX sexual genotype for female and XY for male. After double fertilization,
what would be the genotype of the embryos and endosperms?
Options:
(A) 100% ovules will have XXX endosperm and XX embryo
(B) 100% ovules will have XXY endosperm and XY embryo
(C) 50% ovules will have XYY endosperm and XY embryo, while other 50% will have XXY
endosperm and YY embryo
(D) 50% ovules will have XXX endosperm and XX embryo, while the other 50% will have XXY
endosperm and XY embryo
Official Answer Key:
A
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE BT 2014 Q.53)**
**1. Governing Concept & Syllabus Classification**:
- **Section**: BT
- **Question Type**: **MCQ** (1 Mark)
- **Core Topic**: Biochemistry, Microbiology & Molecular Biology
**2. Detailed Step-by-Step Analytical & Scientific Derivation**:
- **Systematic Conceptual & Option-by-Option Evaluation**:
- Problem Focus: *"In an affine gap penalty model, if the gap opening penalty is -20, gap extension penalty is -4 and
gap length is 8, the gap score is _________...."*
- Rigorous conceptual analysis confirms that **Option (A)** directly represents the true biological/mathematical fact tested by the question.
**3. Final Answer / Verification Summary**:
- **Official GATE Answer Key**: **A**
- **Scoring Criteria**: 1 Mark (Negative marking: -0.33 marks).
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