. The elements of genetics. Genetics. STRUCTURAL HYBRIDITY heterozygous for the new change. The simplest type is the inter- change hybrid. Its movements resemble those of a tetraploid (or tetrasomic) although their genetic consequences are quite different. Interchange, by recombining segments, produces from two old chromosomes, AB and CD, two new ones, BC and DA. When the new and old types pair at pachytene in the hybrid they form a cross arrangement like that given, with one exchange of partners, in a tetraploid; but the position of the exchange of partner is fixed at, or near, the position o
. The elements of genetics. Genetics. STRUCTURAL HYBRIDITY heterozygous for the new change. The simplest type is the inter- change hybrid. Its movements resemble those of a tetraploid (or tetrasomic) although their genetic consequences are quite different. Interchange, by recombining segments, produces from two old chromosomes, AB and CD, two new ones, BC and DA. When the new and old types pair at pachytene in the hybrid they form a cross arrangement like that given, with one exchange of partners, in a tetraploid; but the position of the exchange of partner is fixed at, or near, the position of the interchange. There is no choice (Fig. 29). PACHYTENE PAIRING IN STRUCTURAL HYBRIDS 0< a a <'< b b ccr. 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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