Patau syndrome is a disorder that occurs due to the appearance of a person’s thirteen chromosome three times (trisomy 13) instead of only twice in the cell. In some cases of the disorder‚ only a select percentage of the cells display the third thirteen chromosome while others contain the average amount of pairs‚ this is known as mosaicism. The extra chromosomal material in the cell can lead to many problems in the developmental stages of the humans life‚ these developmental issues cause severe mental
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that Eukaryotic cells have a true nucleus bound by a double membrane. Prokaryotic cells do not have one. Another difference is despite the fact they both have DNA‚ eukaryotic DNA is complexed with proteins called histones and is organized into chromosomes. Prokarytoic DNA is naked‚ meaning it has not histones associated with it‚ and it is not
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whether or not crossing over has occurred. Below‚ no crossing over has occurred. Formation of non‐crossover asci If crossing over occurs‚ it will occur in the region between the gene for spore color and the centromere. The homologous chromosomes then separate during meiosis I. Meiosis I (MI) will result in two cells‚ each containing both genes (1 tan‚ 1 wild‐ type); therefore‚ the genes for spore color have not yet segregated. Meiosis II (MII) results in segregation of the two types of
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creatures. The domain bacteria possess traits which differentiate themselves from other organisms for example bacteria have prokaryotic cells‚ which means that their cells lack a nucleus‚ instead‚ they contain a nucleoid which contains a single circular chromosome. Additionally‚ bacteria do not have membrane-bound organelles‚ but most do have a cell wall made of peptidoglycan which is critical to a bacteria’s survival. In addition to varying cellular structures‚ bacteria also vary in the method by which they
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Centre Number For Examiner’s Use Candidate Number Surname Other Names Examiner’s Initials Candidate Signature Question General Certificate of Secondary Education Higher Tier January 2014 Mark 1 2 3 Additional Science M (modular) MBL2HP 4 Unit Biology B2 5 H Biology M (modular) Unit Biology B2 Wednesday 8 January 2014 9.00 am to 10.00 am 6 7 TOTAL For this paper you must have: a ruler. You may use a calculator. B Time allowed 1 hour Instructions Use black ink or black ball-point
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for a specific trait is located on a sex chromosome‚ resulting in sexually dependent inheritance of the trait (Houghton Mifflin Company 2009). As the first sex-linked gene was found in Drosophila melanogaster (Ladiges‚ Pauline Y 2012) it is appropriate to use them in the study to determine how sex-linked chromosomes effect the offspring. By crossing the male and female Drosophila with different traits we observed the F1 generation and how sex-linked chromosomes were carried into the F1 generation as
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Botany Lab Introduction to Microscope Circa 1000 AD. = the first vision aid was invented (inventor unknown) called a reading stone. Circa 1284= Italian‚ Salvino D’ Armante is credited inventing the first bearable eye glass. 1590= two dutch eye glass makers‚ Zaccharias Janssen and Hans Janssen experimented with multiple lenses. 1665= English Physicist‚ Robert Hooke looked at a silver of cork through a microscope lens and noticed some “pores” or “cells”. 1674= Anton Van Leeuwenhoek built
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14. Genes a. Genes tell your _____ what to do. b. Genes are made of ______. (deoxyribose nucleic acid) c. DNA molecules are packed in your cells in something called ______. d. Now humans have 23 PAIRS of chromosomes‚ you get 23 from your mom and 23 from your dad making a total of ____ chromosomes. 15. An egg is a _____ cell organism. 16. Blood Cells a. We call them red blood cells because they are ____. b. Red blood cells turn red because of the _____. c. White blood are the things that attack viruses
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Make-up test study guide Test 1: 1. 3 categories of natural sciences a. biology: microbiology b. physical: chemistry c. applied: medicine 2. relevant steps to scientific method a. observation b. hypothesis c. experimentation d. conclusion e. extra: theory 3. Science: objective‚ testable‚ fact; non-science: subjective‚ untestable‚ opinions 4. Life is is a characteristic that distinguishes objects that have signaling and self-sustaining processes from those that do not‚ a. Characteristics:
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Is gene therapy the most effective way to treat depression? What really is depression? The term ‘depression’ can be defined in two different ways: 1. Severe despondency and dejection‚ accompanied by feelings of hopelessness and inadequacy. 2. A condition of mental disturbance‚ typically with lack of energy and difficulty in maintaining concentration or interest in life.1 Majority of people believe that depression is somewhat trivial and is not regarded as a genuine health condition‚ but
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