Meiosis Cell Cycle and Cell Division Class 11 Biology neet2025 neetpreparation neetbiologymcqs

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In This part we will study : • Meiosis • Meiosis occurs in living organisms that reproduce by gametes. • Occurrence : • In humans and animals, Its important this division occurs in the testis to produce the • male gametes ( sperms) and in the ovary to form t he female gametes ( ova). • in flowering plants this division occurs in the anther to produce the pollen grains and in the flower ovary to form an egg. • Importance :production of male gametes and females gametes to complete the sexual reproduction. • Phases of meiosis: • 1 – First meiotic division • 2 – Second meiotic division. • First meiotic division • Prophase 1 , Metaphase 1 , Anaphase 1 and Telophase 1 • The crossing over phenomenon • At the end of prophase I, some parts of the two inner chromatids of each tetrad are exchanged to produce new genetic arrangements. This process is called the crossing over phenomenon. • Crossing over phenomenon • It is a phenomenon that takes place at the end of prophase 1 and in which some parts of the two inner chromatids of each tetrad are exchanged to produce new genetic arrangements. • • لينك تحميل الملزمة : • Prep.3 - unit Four - lesson One - First Term 2020 • http://bit.ly/2GO4QN0 • تم شرح هذا الدرس في (2) فيديوهات شاهدها بالترتيب • Cell Division • (Part (1/2 • • Science | Prep.3 | Cell Division | Pa... • (Part (2/2 تشاهده الان • • Science | Prep.3 | Cell Division | Pa... • • لمتابعة مستر احمد الباشا وكل ما يخص الساينس : • جروب الفيس بوك • http://bit.ly/2Of1mcN • صفحة الفيس بوك • http://bit.ly/2Gq5xMo • بالتوفيق • مستر احمد الباشا

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