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مقارنة بين تطور جنين البذرة وجنين البيضة

12 فبراير 2017

سواء في البذرة أو البيضة، يعتمد الجنين في نموه وتطوره على المدخرات الغذائية وعند نفادها، يصبح الجنين كائنا كاملا يتمد على نفسه في التغذية.
*نمو الجنين وتطوره ليس إلا مجموعة من التحولات تطرأ على العنصر الحي (الجنين).
*تتم هذه التحولات عبر مراحل، تميزها تغيرات شكلية (مورفولوجية)، وذلك على حساب المدخرات الغذائية.
*تنتهي هذه التحولات باكتمال تشكل كائن حي جديد، يعتمد على نفسه فيما بعد.

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