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x
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--»
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P1
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P2
|
|
F1
|
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Yellow
|
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green
|
|
all Yellow
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x
|
|
--»
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F1
|
|
F1
|
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F2
|
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Mendel counted all
seeds of the F2
|
|
generation and found
out that there
|
|
is a ratio Yellow :
green = 3 : 1.
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An illustration of what
Mendel
|
|
discovered can be given
with the
|
|
randomly chosen F2
plant below.
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|
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This plant has produced
60 seeds
|
|
of which 47 are yellow
coloured and
|
|
13 green. The ratio
Yellow : green
|
|
with regard to already
this plant
|
|
only is thus 3.61 : 1.
|
|
More plants, and so a
larger
|
|
amount of seeds, show
of course
|
|
the ratio 3 : 1
better.
|
|
Mendel, in his first
experiments,
|
|
raised 8023 seeds; 6022
Yellow and
|
|
2001 green (3.01 : 1).
Later on he
|
|
raised
204147 F2
seeds;
|
|
153902 Yellow and 50245
green
|
|
(3.0008 : 0.9992),
hence 3 : 1.
|
|
|
|
The evidence than that
there are
|
|
discrete units of
heredity in pairs
|
|
grows
stronger.
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|
