. The elements of genetics. Genetics. INCOMPATIBILITY carries a gene, an incompatibility gene, also present in the style. Completely incompatible pairs of plants will then always be such as have both allelomorphs the same. Compatible ones will be such as differ in respect of one or both (Fig. 59). /Vt\. SEED Fig. 59.—Diagram showing the physiological relationship between pollen and style and the genetic relationship between parent and offspring with homomorphic incompatibility. Sj styles receive, (i) self or similar pollen on the left and their ovules remain unfertilized, (ii) in the centr
. The elements of genetics. Genetics. INCOMPATIBILITY carries a gene, an incompatibility gene, also present in the style. Completely incompatible pairs of plants will then always be such as have both allelomorphs the same. Compatible ones will be such as differ in respect of one or both (Fig. 59). /Vt\. SEED Fig. 59.—Diagram showing the physiological relationship between pollen and style and the genetic relationship between parent and offspring with homomorphic incompatibility. Sj styles receive, (i) self or similar pollen on the left and their ovules remain unfertilized, (ii) in the centre mixed pollen part of which, if in sufficient quantity, can fertilize all ovules, and (iii) on the right wholly compatible pollen all of which can fertilize the ovules. Note.—No progeny can be incompatible with their mother, but in the middle case a half will be incompatible with their father. This explanation suggested by Prell in 1921 was confirmed, a few years later, by East and Mangelsdorf with Nicotiana alata and by Filzer with Veronica syriaca. On its basis the inheritance of incom- patibility has been successfully predicted in a large number of diploid plants, hideed the mechanism probably occurs in some stage of development or decay in about half the species of flowering plants. MS. 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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