Define - - - - - - Chromosome : Is an organized structure of DNA and protein found in cells - Chromatids : Is one of the two copies of DNA making up a duplicated chromosome‚ which are joined at their centromeres‚ for the process of cell division Stages of Mitosis + Cell Division 1st : INTERPHASE - Chromosomes are copies (# doubles) - Chromosomes appear as threadlike coils (chromatin) at the start‚ but each chromosome and it’s copy (sister chromosome) change to sister chromatids
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Diversity exists because in meiosis there are possibilities of recombination of chromosomes and independent assortment. Randomness occurs when chromosomes line up on the metaphase plate and crossing over of tetrads occurs (McGraw-Hill). When chromosomes experience crossing over‚ many combinations of different genes can occur which can lead to offspring that have different appearances. “Independent assortment produces chromosome combinations that are not present in either parent” (McGraw-Hill). The number
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Us as a person‚ we have up to 46 chromosomes divided equally between the mother and father. The child therefore gets 23 chromosomes each from both parents. Genes are like the building blocks of hereditary; every child inherits genes from both of their biological parents. Some traits are physical such as: eyes‚ hair and skin color
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present and a double layered membrane surrounds the nuclear body in eukaryotes. Referred to as cell nucleus in eukaryotes‚ such an organelle is called nucleoid in prokaryotes. The nuclear body houses the chromosome in both prokaryotes and eukaryotes. Single in number and circular in shape‚ the chromosome in prokaryotes is made up of Deoxyribonucleic Acid (DNA) and proteins whilst in eukaryotes‚ it is usually more than two in number‚ and composed of DNA‚ histone and other proteins. In terms of ribosomes
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Is abortion an act of murdering a human being? Many will argue that abortion isn’t wrong on the basis that a fetus is not a human being; however‚ many will argue that abortion is wrong because its taking a human life‚ no matter what stage of pregnancy it is in. In my paper I will argue that life begins at conception and arrive at the conclusion that abortion is killing a human being. As well as providing premises for my view‚ I will also provide an objection to my argument. Whatever leads up
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be contracted due to the recipient’s environment. However‚ Harlequin is spread genetically. Males have a higher chance of contracting the disorder‚ since it is present in the X chromosome. Sometimes‚ a female’s second X chromosome can take over‚ and keep the body functioning normally. However‚ with a male’s XY chromosome makeup‚ the body is not able to replace the infected gene‚ causing the person to be infected with Harlequin Ichthyosis (DermNet NZ‚ 2003).
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the genetic information is carried in chromosomes in the nuclei of cells. A chromosome is formed by each DNA molecules coiling around some histone (special proteins). Before mitosis and meiosis‚ chromosomes duplicate. However‚ mitosis only has four stages while meiosis has eight stages. The four stages of mitosis are similar to the first four stages of meiosis that are called prophase‚ metaphase‚ anaphase and telophase. The pairing up of homologous chromosomes only occurs in meiosis‚ but not in mitosis
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Micro-deletion syndromes Di- George syndrome Aetiology Deletion of part of the long arm in chromosome 22 at location 22q11.2(1) The most common deletion includes the TBX1 gene (85% individuals)‚ see figure 1 below. Defect in neural-crest tissue (thyroid‚ thymus‚ and conotruncal septum of the heart) due deletion of region in chromosome 22 (2) Inheritance pattern is autosomal dominant (2) Hypoplasia of thymus and parathyroid glands resulting in hypocalcemia Acronym CATCH22 is used for
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affected by genetic disorders every day. Abnormalities in one’s DNA are what cause a genetic disorder. These disorders could be as little as a mutation in a single gene. In another case‚ they could be as severe as having an extra chromosome‚ or taking away a chromosome. Genetic disorders are present from birth‚ but they may not be visibly seen until a later age. Some mutations could be heritable‚ or from your parents genes. Some forms of cancer can be inherited form a parent. Although‚ in most
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Running Head: ALBINISM ALBINISM Ivy Tech ANP 101 July 9‚ 2008 What is Albinism? Albinism is a hereditary disorder‚ which results in little or no production of the pigment melanin. The disorder is not an infectious disease and cannot be transmitted through contact‚ blood transfusions‚ or other means. Albinism is usually‚ but not always‚ apparent in a person’s skin‚ hair and eyes. The most recognizable form (called oculocutaneous albinism or OCA)‚ results
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