* NCERT 1. Reproduction in Organisms INTRODUCTION Biology in essence is the story of life on earth. While individual organisms die without fail‚ species continue to live through millions of years unless threatened by natural or anthropogenic extinction. Reproduction becomes a vital process without which species cannot survive for long. Each individual leaves its progeny by asexual or sexual means. Sexual mode of reproduction enables creation of new variants‚ so that survival advantage is enhanced
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AP LAB # 3: MITOSIS AND MEIOSIS Website to go for quizzes and activities: Print out the quizzes for mitosis and meiosis http://www.phschool.com/science/biology_place/labbench/ OVERVIEW Exercise 3A is a study of mitosis. You will simulate the stages of mitosis by using chromosome models.You will use prepared slides of onion root tips to study plant mitosis and to calculate the relative duration of the phases of mitosis in the meristem of root tissue. Prepared slides of the whitefish blastula
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Effect of ions on living organisms (24 marks) An ion is a charged atom or molecule. This is because it does not have an equal amount of protons and electrons‚ therefore giving the atom an overall charge. An example of an ion is ‚ this is sodium and the plus sign represents an overall positive charge. Ions are very important to living organisms as they are essential for life‚ they play an important role within the cell allowing mechanisms within the living organisms such as respiration‚ to take
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Between meiosis and mitosis there are many unique similarities and differences such that mitosis has four stages and meiosis has eight. Or a similarity where they both have no new gene combination when each of the cells splits after each of their processes. Many more of these similarities and differences will be explained throughout the text. Many similarities occur between meiosis and mitosis such that each process‚ after it has been gone through‚ result in no new gene combination. Each new cell
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situations and have explained us the science of resuscitation – what happens when we die? Resuscitation medicine is now capable of reviving people after their heart has stopped beating and their brain has flat-lined – objectively died. Patients have described their experience of that period – going beyond the verge of death‚ entering the domain for first few minutes or few hours of time – before they are resuscitated. It provides us indications of what we are all likely to experience when we go through death
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that have unique combinations of genes inherited from the two parents II. 13.2 Fertilization and Meiosis Alternate In Sexual Life Cycles * A life cycle is the generation to generation sequence of stages in the reproductive history of an organism‚ from conception to production of its own offspring C. Sets of Chromosomes in Human Cells * In humans each somatic cell has 46 chromosomes * Karyotype is a display of the chromosomes pairs of a cell arranged by size and shape *
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Comparing Mitosis and Meiosis Observe: 1. Organisms have a number of chromosomes in each of their body or somatic cells that is unique for that organism. This is called their diploid or 2n number. 2. Cells go through a cell cycle‚ whereby‚ much of the cycle does not include division‚ but at the end of this interphase in their cycle‚ they go through mitosis. 3. Cells replicate their DNA in the S phase of the cell cycle. 4. In the process of mitosis‚ cells replicate their DNA in the nucleus‚ form
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Mitosis vs. Meiosis Cell Division is the process of dividing a parent cell into multiple daughter cells by using the Cell Cycle. The Cell Cycle itself is composed of the Interphase‚ usually Mitosis‚ and Cytokinesis. The Interphase‚ which takes up 90% of the Cell Cycle‚ is composed of three phases: Growth 1 (G1)‚ Synthesis (S)‚ and Growth 2 (G2). In the G1 phase‚ the cell grows its size‚ replicates any organelles‚ and functions normally. In the S phase‚ it would prepare to divide its nucleus. Lastly
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More than one celled organisms grow by way of mitosis and the cytoplasmic division of body cells. On the other hand‚ meiosis occurs only in germ cells‚ which are put aside for the formation of gametes (sperm and egg). Reproduction by meiosis allows for species survival and it increases genetic variability. The process‚ during which the germ cells are generated is called meiosis. It represents nature’s solution to the problem of chromosome doubling that would occur‚ if two diploid cells‚ i.e.
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gamete production via meiosis. Explain why the process of mitosis and meiosis are both important to a living organism. When would an organism need to undergo the process of mitosis? Meiosis? What would happen if meiosis did not occur? Mitosis is the cell process of growth and division whereas meiosis is the process of developing reproductive cells. The sperm and egg are critical components for almost all living organisms. Every living organism begins with one cell that came from our father’s
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