مییوسس میں عبور کرنا ______ میں ہوتا ہے؟
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A. Zygotene
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B. Pachytene
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C. None of these
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D. Diakinesis
Explanation
- Crossing over occurs in the pachytene stage of Prophase I in meiosis, where homologous chromosomes exchange genetic material.
- This process increases genetic variation in offspring.
کسی دیئے گئے پرجاتیوں کی آبادی میں تغیر کا ایک اہم ذریعہ جو کراسنگ اوور سے ہوتا ہے؟
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A. Mutations
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B. None of these
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C. Genetic Recombination
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D. Synapsis
Explanation
- Genetic recombination occurs during meiosis when homologous chromosomes exchange genetic material through crossing-over.
- This process increases genetic diversity within a population.
گیم ٹوجینیسیس کے دوران اس پروگرام کا کیا نام ہے جب کروموسوم کے ٹکڑے صحیح سائٹوں پر دوبارہ مل سکتے ہیں لیکن غلط سرے کے ساتھ؟
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A. None of these
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B. Duplication
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C. Inversion
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D. Deletion
Explanation
- Inversion occurs when a segment of a chromosome breaks off, reverses its orientation, and reattaches at the same location.
- This can lead to improper gene alignment but does not involve loss of genetic material like deletion.
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A. Recombination
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B. Duplication
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C. None of these
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D. Replication
Explanation
Crossing over is a form of recombination (or genetic recombination).
It's a type of genetic recombination that occurs during meiosis,
Involving the exchange of genetic material between non-sister chromatids of homologous chromosomes.
This process creates new combinations of alleles, increasing genetic diversity.
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A. Homologous chromosomes exchange identical parts resulting in no genetic variation
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B. Non-homologous chromosomes exchange part
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C. Chromosomes duplicate without any exchange of parts
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D. Homologous chromosomes exchange different pairs leading to recombinant chromatids and increased genetic variation
Explanation
During crossing over in meiosis I, homologous chromosomes exchange different segments, leading to genetic recombination and increased variation.
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