. Contributions from the Laboratory of Plant Genetics. 173 THE AMEBIC AN NATURALIST [Vol. XLV pare only the F2 generation of cross of which the F1 generation is given. If this were granted onr conclu- sions in regard to segregation would be the same. It might be said, however, that sufficient records were made of the Fj generations of the other crosses to know that they differed but little from the family of which the data were recorded. In addition, it is a fact that general. ? £ £ K P Fig. 6. Average ears of No. 60 and No. 58 and the Fi generation of the cross between them. Extremes of the F
. Contributions from the Laboratory of Plant Genetics. 173 THE AMEBIC AN NATURALIST [Vol. XLV pare only the F2 generation of cross of which the F1 generation is given. If this were granted onr conclu- sions in regard to segregation would be the same. It might be said, however, that sufficient records were made of the Fj generations of the other crosses to know that they differed but little from the family of which the data were recorded. In addition, it is a fact that general. ? £ £ K P Fig. 6. Average ears of No. 60 and No. 58 and the Fi generation of the cross between them. Extremes of the F2 generation. populations of the two parents were studied, and their variation was undoubtedly greater than would have been that of the inbred progeny of the three parent plants of either variety. An additional cross between Tom Thumb pop maize and a small purple flint is illustrated in Fig. 6. The ears pictures show the average size of the two parents and the Fj generation, and extremes of the F2 generation. In conclusion there are two points I wish to notice. Unquestionable segregation in size characters has been shown by comparison of the Fi and F2 generations. It can scarcely be doubted that some of these segregates will breed as true as the parent forms, yet one can. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bussey Institution. Boston : [s. n. ]
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