. Botany of the living plant. Botany. 47^ BOTANY OF THE LIVING PLANT which cannot be distinguished from it by appearance, be represented by (D) ; and if R represent the recessive, then the following will be the scheme of inheritance :. Fig. 395. Scheme of inheritance of Dominant, D, and Recessive, R, characters resulting from the crossing of individuals which each bear one of a pair of differentiating characters, through three generations /i, f^, /g. (After Punnett.) In this scheme two pure strains, D, R, each possessing one of a pair of differen- tiating characters, are crossed together. The
. Botany of the living plant. Botany. 47^ BOTANY OF THE LIVING PLANT which cannot be distinguished from it by appearance, be represented by (D) ; and if R represent the recessive, then the following will be the scheme of inheritance :. Fig. 395. Scheme of inheritance of Dominant, D, and Recessive, R, characters resulting from the crossing of individuals which each bear one of a pair of differentiating characters, through three generations /i, f^, /g. (After Punnett.) In this scheme two pure strains, D, R, each possessing one of a pair of differen- tiating characters, are crossed together. The resulting hybrids, Fi, all resemble the dominant parent. When self-fertiUsed they give offspring F2, of which one quarter bear the recessive, and three quarters the dominant character. Of the latter, however, only one-third are pure dominants, giving when self- fertilised, offspring in which the dominant character alone appears. The remaining two-thirds are impure dominants, which on self-fertihsation behave as the original Fi hybrids, yielding pure dominants, impure domin- ants, and recessives in the proportions 1:2:1. This is true for all impure dominants, no matter in which generation they occur. Both the " extracted " pure dominants and the " extracted " pure recessives, which are formed in any generation after a cross, breed true to the types of the original parents used in the cross. In any sexually reproduced organism the gametes form the link between successive adult generations. The characters peculiar to the adult must therefore be represented in their constitution. In the tall Pea somg at least of the gametes, whether male or female, must carry the tall character : for from an impure tall three quarters fl. 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 Bower, F. O. (Frederick
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
