Mendel's principles of heredity: A defenceMendel, Gregor
Science
Mendel's principles of heredity: A defence
Mendel, Gregor
Heredity; Hybridization; Mendel's law; Weldon, Walter Frank Raphael. Mendel's laws of alternative inheritance in peas
In these two experiments each pod yielded usually both kinds of seed.
In well-developed pods which contained on the average six to nine
seeds, it often occurred that all the seeds were round (Expt. 1) or
all yellow (Expt. 2); on the other hand there were never observed more
than five angular or five green ones in one pod. It appears to make no
difference whether the pods are developed early or later in the hybrid
or whether they spring from the main axis or from a lateral one. In
some few plants only a few seeds developed in the first formed pods,
and these possessed exclusively one of the two characters, but in the
subsequently developed pods the normal proportions were maintained
nevertheless.
As in separate pods, so did the distribution of the characters vary in
separate plants. By way of illustration the first ten individuals from
both series of experiments may serve[34].
[34] [It is much to be regretted that Mendel does not give the
complete series individually. No one who repeats such experiments
should fail to record the _individual_ numbers, which on seriation
are sure to be full of interest.]
Experiment 1. Experiment 2.
Form of Seed. Colour of Albumen.
Plants. Round. Angular. Yellow. Green.
1 45 12 25 11
2 27 8 32 7
3 24 7 14 5
4 19 10 70 27
5 32 11 24 13
6 26 6 20 6
7 88 24 32 13
8 22 10 44 9
9 28 6 50 14
10 25 7 44 18
As extremes in the distribution of the two seed characters in one
plant, there were observed in Expt. 1 an instance of 43 round and only
2 angular, and another of 14 round and 15 angular seeds. In Expt. 2
there was a case of 32 yellow and only 1 green seed, but also one of 20
yellow and 19 green.
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