. Cytology. Cytology. CYTOLOGY OF SEX DETERMINATION In bisexual species, either plant or animal, it can generally be pre- sumed that one or the other of the two sexes is heterogcunetic, that it produces two kinds of gametes, one female-determining and the other male-determining. In the majority of bisexual animals as well as in. Figure 8-9. Photomicrograph of 12 Bivalent Chromosomes at First Meiotic Metaphase in Diploid Male of Melaudrium. Note heteromorphic XY pair. (From Warmke. H. E., 1946. "Sex Determination and Sex Balance in Melandrinmr Am. J. Botany, 33, Fig. 1, p. 651.) many
. Cytology. Cytology. CYTOLOGY OF SEX DETERMINATION In bisexual species, either plant or animal, it can generally be pre- sumed that one or the other of the two sexes is heterogcunetic, that it produces two kinds of gametes, one female-determining and the other male-determining. In the majority of bisexual animals as well as in. Figure 8-9. Photomicrograph of 12 Bivalent Chromosomes at First Meiotic Metaphase in Diploid Male of Melaudrium. Note heteromorphic XY pair. (From Warmke. H. E., 1946. "Sex Determination and Sex Balance in Melandrinmr Am. J. Botany, 33, Fig. 1, p. 651.) many plants, the heterogametic sex may be distinguished cytologically by the fact that it contains a heteromorphic pair of chromosomes, the segregation of which at meiosis leads to production of the two kinds of gametes. The heteromorphic pair is generally known as the X-Y pair (Figure 8-9). The Y element is missing from the hotriogametic sex and the X element is represented twice. In some cases, as in several species of grasshopper, the Y element is missing altogether so that the male is XO and the female XX. In other cases, the praying mantid, for example, the X element is compound and consists of two elements which pair CYTOGENETICS / 189. 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 Wilson, G. B. (George Bernard), 1914-; Morrison, John H. (John Herbert), 1927-. New York, Reinhold
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