8:30-11:30 am 3/6/2012 Triple X Syndrome Triple X Syndrome is a sex chromosome abnormality in which there are three X chromosomes instead of the usual two found in most females. Triple X Syndrome is also known as Trisomy X‚ Triplo X Syndrome‚ and XXX Syndrome. The first published report of a woman with a karyotype with a 47‚ XXX was by Patricia A. Jacobs in 1959 at a hospital in Scotland. Most people have 46 chromosomes‚ occurring in 23 pairs. These chromosomes contain genes‚ which carry instructions
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“Eukaryotic chromosomes are generally much bigger than those of prokaryotes. In eukaryotic cells‚ replication may begin at dozens or even hundreds of places on the DNA molecule‚ proceeding in both directions until each chromosome is completely copied. Although a number of proteins check DNA for chemical damage or base pair mismatches prior to replication‚ the system is not foolproof. Damaged regions of DNA are sometimes replicated‚ resulting in changes to DNA base sequences that may alter certain
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Homologous Chromosomes and Sister Chromatids (HC and SC): Clearly distinguish between HC and SC pairs. Your answer should include the following: a clear distinction between ‘chromatin’ and ‘chromosome’‚ and how this difference affects gene expression; simple line diagrams to illustrate the difference between non-replicated and replicated DNA inchromatin and chromosome forms; afull description of both HC and SC with a labeled diagram that includes gene/allele sequences for a heterozygote and ‘m’
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KARYOTYPING LAB INTRODUCTION The complete set of chromosomes in the body cell of a species is known as karyotype. Karyotype is a test to identify and evaluate the size‚ shape‚ and number of chromosomes in a sample of body cells. Any abnormalities such as extra‚ missing‚ or abnormal positions of chromosome pieces can cause problems with a person growth‚ development and body functions. Karyotype can be used to determine whether the chromosomes of an adult have an abnormality that can be passed on
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number of chromosomes and crossing over to get more gene combinations and fertilization‚ involving the fusion of two gametes and the restoration of the original number of chromosomes. 3. Distinguish between the following pairs of terms: Chromosome- structures that makeup DNA Chromatid- DNA wrapped around protein called histone Homologous chromosomes- same but separated Sister chromatids- same but connected by centromere Synapsis- the entire process of pairing two homologous chromosomes Chiasma-
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Chromosome is in the nucleus of every cell. Each chromosome is mostly made up of coiled DNA. Besides DNA‚ there are also proteins in each Chromosome. The interesting point is that in Chromosome‚ DNA tightly coiled a lot of times around proteins and it supports the basic structure of chromosome. The way that Chromosome forms motivates me to think of how DNA and proteins in the Chromosome relate to each other both in the aspect of location and the aspect of biology function. For the second question
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A Chromosome Study Lab An examination of the chromosomes of a cell under high magnification can give much information about an organism. Figure 1 shows the chromosomes of a somatic cell as they might appear in an organism if enlarged many times their natural size. A somatic cell is any cell making up the organism except for reproductive cells. In this investigation‚ it is expected that you: a. learn what a chromosome Karyotype is. b. prepare a Karyotype of chromosomes according to the instructions
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Introduction For a zygote to contain a diploid complement of chromosomes‚ the gametes‚ which fuse to form this zygote must contain half the number of chromosomes. This reduction of chromosome number occurs in two distinct sequential phases of meiosis‚ termed meiosis I and meiosis II. Both divisional sequences have sub-stages such as‚ prophase (I‚ II)‚ prometaphase (I‚ II)‚ metaphase (I‚ II)‚ anaphase (I‚ II)‚ and telophase (I‚ II) that is continued by cytokinesis (I‚ II)‚ which is not part of meiosis
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I clicked on the small‚ conveniently placed "X" in the corner of the window‚ I saw them. The words "rare genetic disease" and Fragile X were strewn all over the porthole‚ which lead into a dreamland of information. A click away and I was on my way into Ms. Frizzle of the Magic School Bus’s classroom‚ just waiting to be educated. (Of course‚ there are no Magic School Bus books written about Fragile X‚ my newfound rare genetic disease friend.) Fragile X syndrome affects one in four thousand males
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over occurs between homologous chromosomes. These are the pairs of chromosomes in an organisms body that carry genes for the same trait located at identical positions on the two chromosomes. Even though they carry the same gene they may‚ however‚ possess different alleles for the gene which result in different forms of the trait. Pre-Lab (3 points): 1. Draw a tetrad in the space below and label the following: centromeres‚ sister chromatids‚ homologous chromosomes. 2. What are the two elements
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