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Published byΣουσάννα Κουρμούλης Modified over 6 years ago
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An Organized Picture of Your Chromosomes!!
Karyotypes An Organized Picture of Your Chromosomes!!
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Creating a Karyotype During cell division (metaphase), stain the chromosomes and then take a picture. Magnify the picture to make the chromosomes larger. Cut out and place in order pair 1-23 from largest to smallest.
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How to determine the sex of the individual.
Human Karyotype has 23 pairs of chromosomes. Pair 23 is the sex chromosomes – If the 23rd pair looks identical it is XX, if they look different it is XY. No matter how many chromosomes you see, if there is a shorter chromosome in pr 23 it is male.
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Human Karyotype 1 – 22 Autosomal Chromosomes Pair 23 – Sex Chromosomes
Male – XY Female - XX Absence of Presence of the Y chromosome determines the sex of the individual
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Female Notice the Y spot is there but there is nothing in it.
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Male No matter the number of X chromosomes, the presence of a Y makes it a male
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What is the point? Use this picture to diagnose chromosomal disorders such as Down Syndrome – Trisomy 21 Turner’s Syndrome – X Klinefelter’s Syndrome – XXY How do chromosomal disorders happen? Nondisjunction – “Not coming apart” When this happens abnormal numbers of chromosomes may find their way into gametes.
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Karyotypes Show Chromosomal Mutations
Deletion – Loss of all or part of chromosome Duplication – Extra portion of chromosome Inversion – Chromosome is oriented in the reverse direction Translocation – Part of a chromosome attaches to another nonhomologous chromosome
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Deletion Karyotype
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Duplication Karyotype
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Translocation Karyotype
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http://www. biology. arizona
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