A chromosome study
This presentation is the property of its rightful owner.
Sponsored Links
1 / 11

A Chromosome Study PowerPoint PPT Presentation


  • 71 Views
  • Uploaded on
  • Presentation posted in: General

A Chromosome Study. Please pick up 1 set of chromosomes marked “normal” and 1 set of abnormal chromosomes labeled A B C or D, in addition to the lab handout If you have scissors, begin cutting out the “normal” chromosomes. If not, begin reading the lab handout. Genetic Screening.

Download Presentation

A Chromosome Study

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


A chromosome study

A Chromosome Study

Please pick up 1 set of chromosomes marked “normal” and 1 set of abnormal chromosomes labeled A B C or D, in addition to the lab handout

If you have scissors, begin cutting out the “normal” chromosomes. If not, begin reading the lab handout


Genetic screening

Genetic Screening

  • Developing fetuses can be tested for some severe genetic disorders by the process of karyotyping – which analyzes the chromosomes found in each cell.

  • In this activity you will perform a karyotype on a “normal” set of chromosomes as well as an “abnormal” one.


Karotype the most accurate test for down s syndrome and other disorders

Karotype: the most accurate test for Down’s Syndrome and other disorders.

  • A karyotype is a picture of all of the chromosomes found in the cells of an organism

  • Chromosomes are stained, photographed, and then arranged from largest to smallest


Normal karyotype

Normal Karyotype

  • Humans almost always have 23 pairs of homologous chromosomes.

  • Is this karyotype of a male or female?


Abnormal karyotype

Abnormal Karyotype

  • Some serious genetic disorders are caused by trisomy – a certain kind of mutation that gives an individual 3 copies of a chromosome.

  • The karyotype below shows trisomy-21, better known as Down’s Syndrome.


Your karyotypes

Your Karyotypes

  • You will be constructing 2 karyotypes.

  • The first will be a normal male or female, (46 XY or 46 XX)

  • The second will have a trisomy disorder.

  • This is a lab activity!


Patau syndrome trisomy 13

Patau Syndrome:Trisomy 13


Down s syndrome trisomy 21

Down’s Syndrome:Trisomy 21


Edward syndrome trisomy 18

Edward SyndromeTrisomy 18


Klinefelter syndrome xxy

Klinefelter SyndromeXXY


What to do

What to do

  • Cut out all of the chromosomes in the normal set.

  • Pair up homologous chromosomes – they are identical in size and banding pattern

  • Separate the sex chromosomes from the autosomes.

  • Arrange the pairs of autosomes from largest to smallest.

  • Label 1 side of the Human Karyotype Form as “normal.” Glue X chromosomes over the line marked X, Y chromosomes over the line marked Y.

  • Glue the largest pair over the line numbered 1. Glue the next largest over the line numbered 2. Continue until the smallest pair is glued over number 22.

  • Repeat the procedure for the abnormal set. There will be one extra chromosome in this set – but which number is it?


  • Login