Mendel's
garden
(Augustinian
Monastery
of St. Thomas, Brno, Czech Republic)
Mendel's
garden
(Augustinian
Monastery
of St. Thomas, Brno, Czech Republic)
Mendel conducted
his experiments both in a greenhouse and in outdoor garden
plots. A statue of Mendel appears in the
background. The garden plot shown here is laid out as a
series of crosses between flowers, starting from the upper
right. The parental plants (P)
have red and white flowers (top row). From
these pure-breeding red- and white-flowered plants, the F1 is
uniformly red (single patch, second row). The third row shows
the result of an F2 cross of the F1
back to the white P plants: note the 3:1 ratio of red to white
flowers.
The following 4
x 4 layout show the result of a dihybrid cross. Closer inspection shows that in the P
generation, the white flowers are also tall,
in contrast to the red flowers that are short.
These two phenotypes can be followed through the crosses in
combination with the color variants.
Homework: Evaluate the
results of the dihybrid cross. Is there anything unusual about
the results?