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JIPMER 2009
Exam
JIPMER
Year
2009
Subject
Zoology
Chapter
Principles of Inheritance and Variation

JIPMER 2009 · Zoology · Principles of Inheritance and Variation

The trisomy for 21^ st chromosome is called

The trisomy for 21st 21^{\text{st }} chromosome is called

Options

  1. ADown's syndrome
  2. BTurner's syndrome
  3. CTurner's syndrome
  4. DKlinefelter's syndrome

Correct answer

A. Down's syndrome

Step-by-step solution

<tableclass="qx−match−listqx−match−table"border="1"cellpadding="6"cellspacing="0"><tr><td>Abnormality<table class="qx-match-list qx-match-table" border="1" cellpadding="6" cellspacing="0"><tr><td>AbnormalityCauseCharacteristicDown′ssyndrome\begin{array}{l} Down's syndrome \end{array}Trisomyof21stautosome</td></tr><tr><td>(45A+XX/XY)\begin{array}{l} Trisomy of 21st autosome</td></tr><tr><td>(45 A + XX/XY) \end{array}Mentalretardation,</td></tr><tr><td>prominenthead,</td></tr><tr><td>flattenednasalbridge,</td></tr><tr><td>habituallyopenmouth</td></tr><tr><td>andprojectinglowerlips\begin{array}{l} Mental retardation,</td></tr><tr><td>prominent head,</td></tr><tr><td>flattened nasal bridge,</td></tr><tr><td>habitually open mouth</td></tr><tr><td>and projecting lower lips \end{array}Turner′ssyndrome\begin{array}{l} Turner's syndrome \end{array}Non−disjunction</td></tr><tr><td>ofsexchromosome</td></tr><tr><td>(2n=4544A+XO)\begin{array}{l} Non-disjunction</td></tr><tr><td>of sex chromosome</td></tr><tr><td>\binom{2 n=45}{44 A+XO} \end{array}Sterilefemale,webbed</td></tr><tr><td>neck,nobreast</td></tr><tr><td>development,no</td></tr><tr><td>menstruationoregg</td></tr><tr><td>production\begin{array}{l} Sterile female, webbed</td></tr><tr><td>neck, no breast</td></tr><tr><td>development, no</td></tr><tr><td>menstruation or egg</td></tr><tr><td>production \end{array}Klinefelter′ssyndrome\begin{array}{l} Klinefelter's syndrome \end{array}Non−disjunction</td></tr><tr><td>ofsexchromosome</td></tr><tr><td>(2n=4744A+XXY)\begin{array}{l} Non-disjunction</td></tr><tr><td>of sex chromosome</td></tr><tr><td>\binom{2 n=47}{44 A+XXY} \end{array}Gynecomastiainmales,</td></tr><tr><td>mentallydefective,</td></tr><tr><td>testesunderdeveloped\begin{array}{l} Gynecomastia in males,</td></tr><tr><td>mentally defective,</td></tr><tr><td>testes underdeveloped \end{array}Sicklecellanaemia\begin{array}{l} Sickle cell anaemia \end{array}Moleculargene</td></tr><tr><td>mutationofgene</td></tr><tr><td>HbA\begin{array}{l} Molecular gene</td></tr><tr><td>mutation of gene</td></tr><tr><td>Hb^{A} \end{array}Sickle−shapedRBCs,do</td></tr><tr><td>nottransportO2</td></tr><tr><td>efficiently\begin{array}{l} Sickle-shaped RBCs, do</td></tr><tr><td>not transport O_2</td></tr><tr><td>efficiently \end{array}$
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