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Question #45338
The Question
A superior hybrid plant with genotype AaBb (where genes A and B are located on different, non-homologous chromosomes) shifts exclusively to apomictic seed production via diplospory. Which of the following statements accurately describes the genetic consequences for its seed progeny?
Options
- A.
The genes A and B will exhibit a recombination frequency of 50% due to their location on non-homologous chromosomes.
- B.
The entire diploid genome is inherited as a single 'frozen' unit, effectively reducing the recombination frequency between A and B to zero.
- C.
Segregation of alleles 'A' and 'a' will occur during megasporogenesis, but syngamy is completely bypassed.
- D.
The progeny will display a 3:1 phenotypic ratio for both traits due to the absence of crossing over.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Comparative_Analysis
Sharpen your ability to evaluate multiple scenarios and distinguish between competing potential answers.
Concepts Behind This Question
Apomixis|Linkage|Recombination_Frequency
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often rigidly memorize that 'genes on different chromosomes assort independently'.
The trap is failing to realize that independent assortment and segregation are strictly meiotic phenomena.
If apomixis bypasses meiosis, the physical location of genes (linked vs. unlinked) becomes irrelevant; the entire genome is inherited as a single, non-recombining clonal block, which is why apomixis is used to maintain hybrid vigor.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Sexual Reproduction in Flowering Plants - Class 12 |
| Concept | Apomixis Genetics |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |