Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R):
Assertion (A) : During meiosis, genetic recombination occurs which leads to genetic diversity among offspring.
Reason (R) : Genetic recombination is facilitated by the crossing over of homologous chromosomes during prophase I of meiosis.
In light of the above statements, choose the most appropriate answer from the options given below:
नीचे दो कथन दिए गए हैं, एक को अभिकथन (A) और दूसरे को कारण (R) के रूप में लेबल किया गया है:
अभिकथन (A) : अर्धसूत्रीविभाजन (meiosis) के दौरान, आनुवंशिक पुनर्संयोजन (genetic recombination) होता है जो संतानों में आनुवंशिक विविधता की ओर ले जाता है।
कारण (R) : आनुवंशिक पुनर्संयोजन अर्धसूत्रीविभाजन के प्रोफेज I (पूर्वावस्था I) के दौरान समजात गुणसूत्रों के विनिमय (crossing over) द्वारा सुगम होता है।
उपरोक्त कथनों के आलोक में, नीचे दिए गए विकल्पों में से सबसे उपयुक्त उत्तर चुनिए:
Meiotic Crossing Over and Genetic Recombination:
- Assertion (A) is CORRECT: Sexual reproduction generates vast novel combinations of maternal and paternal alleles in offspring due to meiotic genetic recombination and independent assortment.
- Reason (R) is CORRECT and correctly explains (A): During the pachytene stage of Prophase I of meiosis, homologous chromosomes pair closely (synapsis) to form tetrads. Non-sister chromatids undergo physical reciprocal exchange of genetic segments mediated by the synaptonemal complex and recombinase enzymes (crossing over), creating novel recombinant chromatids containing new combinations of alleles that directly produce genetic diversity in gametes.
Therefore, both (A) and (R) are correct and (R) is the correct explanation of (A).
Correct Answer: Option 1.
विस्तृत व्याख्या:
Meiotic Crossing Over and Genetic Recombination (अर्धसूत्रीविभाजन एवं जीन विनिमय):
- Assertion (A) is CORRECT: Sexual reproduction generates vast novel combinations of maternal and paternal alleles in offspring due to meiotic genetic recombination and independent assortment.
- Reason (R) is CORRECT and correctly explains (A): During the pachytene stage of Prophase I of meiosis, homologous chromosomes pair closely (synapsis) to form tetrads. Non-sister chromatids undergo physical reciprocal exchange of genetic segments mediated by the synaptonemal complex and recombinase enzymes (crossing over), creating novel recombinant chromatids containing new combinations of alleles that directly produce genetic diversity in gametes.
Therefore, both (A) and (R) are correct and (R) is the correct explanation of (A).
Correct Answer: Option 1.
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