. A cytological study of haploid Crepis capillaris plants. Karyokinesis; Crepis. Fig. 10. Haploid Crepis capillaris. a, b, elongating chromosomes at IT; c, furrowing, a, paraffin material. TABLE 2 The Frequency of Tetrads, Triads, Etc., in Haploid Plants Plant No. Tetrad Triad Diad Monad 8 23 52 5 10 15 69 5 28X20-2 1 19 74 2 Total 19 57 195 12 Table 2 shows the frequency with which tetrads, triads, diads, and monads were observed in smears from three buds. Diads are most frequent, triads are fairly common, monads, and tetrads are infre- quent and only one instance of a pen
. A cytological study of haploid Crepis capillaris plants. Karyokinesis; Crepis. Fig. 10. Haploid Crepis capillaris. a, b, elongating chromosomes at IT; c, furrowing, a, paraffin material. TABLE 2 The Frequency of Tetrads, Triads, Etc., in Haploid Plants Plant No. Tetrad Triad Diad Monad 8 23 52 5 10 15 69 5 28X20-2 1 19 74 2 Total 19 57 195 12 Table 2 shows the frequency with which tetrads, triads, diads, and monads were observed in smears from three buds. Diads are most frequent, triads are fairly common, monads, and tetrads are infre- quent and only one instance of a pentad (in another smear) was seen. Young microspores frequently contain two nuclei. As would be expected from the variation in chromosome number in telophase nuclei, the young microspores in most groups are very different in size. Indeed many of the microspore groups called tetrads or triads would be better described as triads or diads with one or two micro- cytes. Diad cells are usually markedly different in size. Figure 11 illustrates a few of the many kinds of microspore groups 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 Hollingshead, Lillian, 1900-. Berkeley, Calif. , University of California press
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