MEIOSIS We study Gametes through a Karyotype Each pair is called a homologous pair Diploid= 23 pairs of chromosomes and 46 total chromosomes (2n) Haploid= 23 individual pairs Mitosis- makes body cells‚ or asexual reproduction like cloning Meiosis- makes sex cells Crossing Over- Occurs in Prohpase I - each group of 4 chromatids are called a tetrad. Individual chromatids may wrap around eachother and pieces may break off and reattach to other chromatids. Genes on chromosomes may change places
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Mitosis Biology Project Dania Abu Zahra‚ Hadeel Kashash‚ Nada Mubarak‚ Reem Al Ahbabi What is Mitosis? Mitosis is the process by which a cell‚ which has previously replicated each of its chromosomes‚ separates the chromosomes in its cell nucleus into two identical sets of chromosomes‚ each set in its own new nucleus. It is a form of nuclear division. It is generally followed immediately by cytokinesis. Mitosis and cytokinesis together define the mitotic (M) phase of the cell cycle—the division of
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the sperm in males and the ova in females. 2. Meiosis is the process of cell division through which gametes are formed. It halves the number of chromosomes so each gamete contains 23. 3. In meiosis‚ the chromosomes pair up and exchange segments in a process called crossing over‚ so that genes from one are replaced by genes from another. Then chance determines which member of each pair will gather with others and end up in the same gamete. 4. Meiosis leads to variability among offspring. When sperm
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to state the hypothesis that was tested here. 2 of 16 2004-2005 Name __________________________________ AP Biology LAB 3. MITOSIS & MEIOSIS ESSAY 1987 Discuss the process of cell division in animals. Include a description of mitosis and cytokinesis‚ and of the other phases of the cell cycle. Do not include meiosis. ESSAY 2004 Meiosis reduces chromosome number and rearranges genetic information. a. Explain
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10. Errors and Redesign. Throughout this experiment a number of random and procedural errors were apparent; these errors could have affected the results of the experiment in a number of ways. One experimental error that occurred during the experiment was that some flies became stuck in the food source and died. The main cause of this was the fact that the fly vials were stood up (vertically) before the flies had fully recovered from the anaesthetic. This could be overcome in future experiments by
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Life on earth A. Procaryotic Organisms 1. The prokaryotic cell‚ unlike the eukaryotic cell‚ is able to survive in an oxygen-deprived‚ mineral-deprived and vitamin-deprived environment. The normal cells in our body‚ the eukaryotic cells need oxygen‚ vitamins and minerals to be able to survive. 2. The classification system of prokaryotes Classification of Prokaryotes Procaryotes can be divided into two distinct groups‚ archaea and eubacteria. Each group has its own characteristics
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LIVING THINGS * All living things come from other living things. * Ex: One single celled organism to another * DNA is copied & passed to offspring * The signature molecule of life * Ex: embryo- cells continually divide & develop EVOLUTION * Why do some organisms seem suited for their environment * Ex: Hummingbird- long beak for nectar in certain flowers * Ex: Cheetahs- take down faster prey * Adaptation- inherited characteristic that
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Tentative Lecture Schedule (If needed‚ the schedule will be revised. Please use Bb Learn for updates) Week Date Topic 2- Sept 1 Labor Day (University closed) Sept 3 What are the major components of the cell? Cells & organelles; organelle dynamics. What happens to a cell when an organelle malfunctions? Students who have not completed ALL of the assignments will be administratively dropped from the course Describe the structure of the plasma membrane. How does its structure
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INTRODUCTION INTO SEEDS AND FLOWERS REVIEW+MORE The cycle of life for a plant starts off as a seed. The seed goes through mitosis and turns into a nature plant‚ which sometimes may produce flowers and fruits. Fruits are where the new seeds can be found‚ continuing the life cycle. A monocot seed with 2 genetic codes (2N) would grow by mitosis. The growth by mitosis would lead to the growth of the apical tips. The meristem cells (stem cells) keep dividing. Then the zone of elongation‚
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Name: ________________________ Class: ___________________ Date: __________ ID: A Genetics test questions Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____ 1. Pea plants were particularly well suited for use in Mendel’s breeding experiments for all of the following reasons except that a. peas show easily observed variations in a number of characters‚ such as pea shape and flower color. b. it is possible to completely control matings
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