ক্রোমোজোম (Chromosome)
নিউক্লিয়াসের ভিতর অবস্থিত নিউক্লিওপ্রোটিন দ্বারা গঠিত যে সব তন্তুর মাধ্যমে জীবের যাবতীয় বৈশিষ্ট্য বংশ পরম্পরায় সঞ্চারিত হয়, তাকে ক্রোমোজোম বলে। ক্রোমোজোমকে জীবের বংশগতির এ ধারক ও বাহক বলা হয়। ১৮৭৫ সালে স্টাসবুর্গার সর্বপ্রথম ক্রোমোজোম আবিষ্কার করেন। কিন্তু তিনি এর নামকরণ করেন নি। ১৮৮৮ সালে বিজ্ঞানী ওয়ালডেয়ার (Waldeyer) সর্বপ্রথম ক্রোমোজোম নামটি ব্যবহার করেন।
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