Select a family in which any one of the traits such as tongue rolling, widow's peak, blood groups’, red-green colour blindness, dimple in the cheek, hypertrichosis of ear, hitch-hiker's thumb, etc., is found.
Check whether the person is exhibiting the trait or not and check in which of his/her parents, grandparents (both maternal and paternal), their children and grandchildren the trait is present.
Among surviving individuals, the trait may also be examined.
The information made available is the basis for the preparation of pedigree chart using the appropriate symbols.
A careful examination of the pedigree chart would suggest whether the gene for the character is autosome linked dominant or recessive, X - chromosome linked dominant or recessive, Y- chromosome linked or not.
Simulator Procedure
Autosomal dominant trait
Drag and drop the affected female symbol in autosomal dominant trait branches tree.
Drag and drop the affected male symbol in autosomal dominant trait branches tree.
Drag and drop the normal female symbol in autosomal dominant trait branches tree.
Drag and drop the normal male symbol in autosomal dominant trait branches tree.
Click on the Next button.
Drag and drop the affected female symbol in autosomal dominant trait branches tree.
Drag and drop the affected male symbol in autosomal dominant trait branches tree.
Drag and drop the normal female symbol in autosomal dominant trait branches tree.
Drag and drop the normal male symbol in autosomal dominant trait branches tree.
Click on the Next button.
Drag and drop the affected female symbol in autosomal dominant trait branches tree.
Drag and drop the affected male symbol in autosomal dominant trait branches tree.
Drag and drop the normal female symbol in autosomal dominant trait branches tree.
Drag and drop the normal male symbol in autosomal dominant trait branches tree.
Click on the Next button.
Autosomal recessive trait
Drag and drop the normal female symbol in autosomal recessive trait branches tree.
Drag and drop the carrier male symbol in autosomal recessive trait branches tree.
Drag and drop the carrier female symbol in autosomal recessive trait branches tree.
Drag and drop the affected male symbol in autosomal recessive trait branches tree.
Click on the Next button.
Drag and drop the carrier male symbol in autosomal recessive trait branches tree.
Drag and drop the carrier female symbol in autosomal recessive trait branches tree.
Drag and drop the affected male symbol in autosomal recessive trait branches tree.
Drag and drop the affected female symbol in autosomal recessive trait branches tree.
Click on the Next button.
Drag and drop the affected male symbol in autosomal recessive trait branches tree.
Drag and drop the affected female symbol in autosomal recessive trait branches tree.
Drag and drop the affected male symbol in autosomal recessive trait branches tree.
Drag and drop the affected female symbol in autosomal recessive trait branches tree.
Click on the Next button.
Drag and drop the carrier male symbol in autosomal recessive trait branches tree.
Drag and drop the normal female symbol in autosomal recessive trait branches tree.
Drag and drop the normal male symbol in autosomal recessive trait branches tree.
Drag and drop the carrier female symbol in autosomal recessive trait branches tree.
Click on the Next button.
Drag and drop the carrier male symbol in autosomal recessive trait branches tree.
Drag and drop the carrier female symbol in autosomal recessive trait branches tree.
Drag and drop the carrier female symbol in autosomal recessive trait branches tree.
Drag and drop the carrier male symbol in autosomal recessive trait branches tree.
Click on the Next button.
X-linked dominant trait
Drag and drop the affected female symbol in the X-linked dominant trait branches tree.
Drag and drop the normal male symbol in the X-linked dominant trait branches tree.
Drag and drop the normal male symbol in the X-linked dominant trait branches tree.
Drag and drop the affected female symbol in the X-linked dominant trait branches tree.
Click on the Next button.
Drag and drop the normal male symbol in the X-linked dominant trait branches tree.
Drag and drop the affected female symbol in the X-linked dominant trait branches tree.
Drag and drop the affected male symbol in the X-linked dominant trait branches tree.
Drag and drop the normal female symbol in the X-linked dominant trait branches tree.
Click on the Next button.
X-linked recessive trait
Drag and drop the carrier female symbol in the X-linked recessive trait branches tree.
Drag and drop the carrier female symbol in the X-linked recessive trait branches tree.
Drag and drop the normal male symbol in the X-linked recessive trait branches tree.
Drag and drop the normal male symbol in the X-linked recessive trait branches tree.
Click on the Next button.
Drag and drop the normal male symbol in the X-linked recessive trait branches tree.
Drag and drop the carrier female symbol in the X-linked recessive trait branches tree.
Drag and drop the normal female symbol in the X-linked recessive trait branches tree.
Drag and drop the normal male symbol in the X-linked recessive trait branches tree.
Click on the Next button.
Drag and drop the normal male symbol in the X-linked recessive trait branches tree.
Drag and drop the carrier female symbol in the X-linked recessive trait branches tree.
Drag and drop the carrier female symbol in the X-linked recessive trait branches tree.
Drag and drop the normal male symbol in the X-linked recessive trait branches tree.
Click on the Next button.
Y chromosome linked trait
Drag and drop the affected male symbol in the Y chromosome linked trait branches tree.
Drag and drop the normal female symbol in the Y chromosome linked trait branches tree.
Drag and drop the affected male symbol in the Y chromosome linked trait branches tree.
Drag and drop the affected male symbol in the Y chromosome linked trait branches tree.
Click on the ‘Reset’ button to redo the experiment.
Observations
Students come to know about how to prepare the pedigree chart for particular disorders and they can analyse which type of disorder affected different families.
