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SCIPAD - BIG IDEAS - BOOK 2
THE BASIS OF HEREDITY
Karyotypes
A karyotype is a picture of the chromosomes in a cell, and is used to check for abnormalities. A
karyotype is created by staining the chromosomes with dye and photographing them through a
microscope. The photograph is then cut up and rearranged so that the chromosomes are lined
up into matching pairs.
1. Half of a female human karyotype has been completed. The remaining unsorted
chromosomes are at the bottom of the page. Cut out these chromosomes and find the
correct place for them.
2. Glue them in place once you are sure of their correct placement.
(a) State the number of chromosomes found in a normal human body cell. 
(b) Chromosomes are arranged into 23 pairs. Where does each member of the pair come
from? 

(c) Number your chromosome pairs. Label the pair at the top left as ‘1’ and continue until you
get to pair 23 on the bottom right.
(d) What is special about ‘Pair 23’? 
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