. The elements of genetics. Genetics. none Plumhago. yremivm n- hre-fushtK 4. -/ e xc ess '(Sync/jo/azi/ ^"|hy|bcrc/io/- hyfyochaJazy Fig. 50.—Variations in the development of the embryo sac in Angiosperms dis- regarding the number of spores which take part in it. Egg cell nucleus solid, other nuclei with one dot for each haploid set. 8 means 3 mitoses before egg cell formation, 16 means 4. -f and — refer to excess or deficiency in the number of mitoses at the chalazal end of the embryo sac and thus imply a gradient. E, the endosperm which varies in ploidy according to the number of nucle
. The elements of genetics. Genetics. none Plumhago. yremivm n- hre-fushtK 4. -/ e xc ess '(Sync/jo/azi/ ^"|hy|bcrc/io/- hyfyochaJazy Fig. 50.—Variations in the development of the embryo sac in Angiosperms dis- regarding the number of spores which take part in it. Egg cell nucleus solid, other nuclei with one dot for each haploid set. 8 means 3 mitoses before egg cell formation, 16 means 4. -f and — refer to excess or deficiency in the number of mitoses at the chalazal end of the embryo sac and thus imply a gradient. E, the endosperm which varies in ploidy according to the number of nuclei fusing in the centre. Zca, Cooper, 1938. Ocnonc, Went-Maheshwari, 1936. Plumbago, Haupt, 1931, rritillnria, Westfall, 1940. Pyrcthrum, Martinoli, 1939 (</. Darlington and La Cour, 1941). In this question of life or death the part played by the cytoplasm can be as crucial as that of the nucleus. In certain hybrid species of Oenothera, whose organization we shall consider later, two genetically different types of germ cells are produced, say A and B, such that ^00. 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 Darlington, C. D. (Cyril Dean), 1903-; Mather, Kenneth. New York : Macmillan
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