builds up in the liver‚brain and eyes. Wilson’s disease is an autosomal recessive trait. (Autosomal recessive trait: means two copies of an abnormal gene must be present in order for the disease or trait to develop) Wilson disease is located on chromosome 13. The gene is called ATP7B and it contains the genetic information necessary to make a copper transport copper out of the liver. Mutations in the gene lead to an abnormal copper transport
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poles by kinteochores. Telophase I - Spindle microtubules dissappear‚ cytokinesis occurs‚ and the nuclear envelope reappears. 2. Describe homologue pairing and crosing over. At which stage of meiosis do they occur? A: When two homologous chromosomes come together before division‚ it’s homologue pairing. This is so that they can separate properly‚ and the cell makes sure that each daughter gets one copy. Cossing over is when two homologous pairs trade their DNA. A piece of dna from one will
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process of creating cloned cells or organisms. The process differs‚ depending on the kinds of cells used in the cloning procedure and the desired result. Usually‚ when scientists clone an animal‚ they take the nucleus of a cell -- which contains chromosomes made of deoxyribonucleic acid (DNA) and proteins -- and place it into an egg cell (also called an oocyte) from which the nucleus has been removed. The egg cell then divides to produce an embryo that
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of histone proteins‚ and then the chromatin folds back on it‚ nucelosomes pack together to create a compact‚ protein-coated fiber‚ and the fiber coils to shorten further into an extended chromosome. Finally‚ the coiled fiber organizes into loops coming from a central axis‚ creating a condensed‚ X-shaped chromosome. 2. Why is a sport drink used to collect the cheek cells instead of water? Sports drink which is saline solution contains sodium chloride which makes the solution compatible with osmotic
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the nucleus replicates. Therefore‚ the chromosomes consist of two identical chromatids each. However‚ they are invisible. 2. Prophase‚ in this stage chromosome becomes visible as they become shorter and thicker. Replicated centrioles move opposite poles of nucleus and a spindle is formed. Nuclear envelope and nucleolus disappear. Chromosomes become visible and the two chromatids are attached to each other at centromere. 3. Metaphase‚ in this stage chromosomes are attached to spindle by centromeres
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condense by coiling‚ to form chromosomes. The spindle fibres are pulled to opposite sides/poles of the cell. 3. Metaphase: The spindle fibres attach themselves to the centromeres of the chromosomes. 4. Anaphase: The spindle fibres shorten and the centromere splits‚ separated sister chromatids are pulled along behind the centromeres. 5. Telophase: The chromosomes reach the poles of their respective spindles. Nuclear envelope reform before the chromosomes uncoil. The spindle fibres
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cells are bounded by a plasma membrane‚ all contain cytosol‚ and all have chromosomes and ribosomes; they differ in the location of their DNA‚ organelles in the cytoplasm‚ and their size. All cells share certain basic features. They are bounded by a selective barrier known as the plasma membrane. All cells contain cytosol which is a semifluid‚ jelly-like substance. Also all cells have chromosomes and ribosomes. Chromosomes carry genes in the form of DNA. Ribosomes are tiny complexes that make proteins
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have a section near the tip that is in clear focus. Now‚ increase the power of magnification (400X). Select an area and count out about 100 cells (approximately). Notice if the cells are: a) Dividing (chromosomes visible‚ no nucleus)‚ b) Not dividing (nucleus visible‚ no chromosomes) Fill in the following table: |Out of about 100 cells: | |Number of Dividing Cells
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demanding answers. Why doesn’t he look like me? Why does he act young? I just wanted to know why. That is when my parents sat me down and talked about it. “Radney has an extra chromosome” My mom said‚ “He was born that way.” This made no sense‚ how could someone be born with an extra chromosome. What even is a chromosome? “It is a gene‚” My dad claimed‚ “It is something we all have that makes us who we are.” It is just who we are. Those words set home to me. My brother was made different then
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the reproductive organs‚ and meiosis has sex cells whereas mitosis does not (Simon‚ Reece‚ & Dickey‚ 2010). The diploid cells split up to form four haploids (form of cell division that most eukaryotic cells undergo)‚ however‚ only half of the chromosomes are the parent cells and occurs in all organisms that have sex cells (Simon‚ Reece‚ & Dickey‚ 2010). Ex: humans‚ animals‚ most fungi‚ and plants. Mitosis is the form of cell division that most eukaryotic cells undergo. In humans‚ all somatic
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