animals (eukaryotes) undergo a similar process for cellular division/reproduction? Both plant and animal cells undergo mitosis and meiosis. In plants‚ there is an alternation of generations; the gametophyte generation‚ where haploid gametes (pollen and ovule; sperm and egg) are produced via mitosis. Then the sporophyte generation combines these two into spores via meiosis‚ resulting in a diploid zygote which can grow into new cells. 2. Describe the sun as the ultimate source of energy for life?
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1.1 What is developmental science‚ and what factors stimulated expansion of the field? Developmental science is an area of scientific study that strives to understand why some things change and others remain constant as we age. The field of developmental science is expanding rapidly due to an exerted social pressure to improve the lives of people. 1.3 Describe the lifespan perspective on development. The lifespan perspective on development is that no one age period impacts development more than
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adjacent to the nucleus that contains the centrioles and serves to organize microtubules. 2. How does the process of mitosis compare with meiosis? In mitosis‚ each of the two new cells (called the daughter cells) resulting from the cell division receives the same number of chromosomes that were present in the precursor cell (called the parent cell). In meiosis‚ the number of chromosomes is reduced so that the daughter cells receive only half of the chromosomes possessed by the parent cell. This process
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Expt. 7. Sexual Plant Reproduction: Testing conditions required for pollen germination and tube growth ____________________________________________________________________________ File: pollen Modified from E. Moctezuma & others for BSCI 442 (Sze) Objectives: Get familiar with the parts of flowers: male and female organs Observe pollen germination and tube growth in real time. Test the conditions that stimulate pollen germination and tube growth. Observe cytoplasmic streaming (due
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Grade 11 University Biology Exam Teacher: Mr. Anderson SBI 3U1 Jan 21‚ 2009 Time: 2 hours Total Marks /111 Pages 1-8 Name: _________________________ Instructions 1. All questions should be answered on the exam page. 2. There will be no talking and/or other disruptions during the exam. 3. If you have any questions raise your hand and a teacher will come to your desk to help you. 4. When you are finished please raise your hand the teacher will come to you
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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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