. Plant genetics . Heredity; Mendel's law; Plant breeding. 178 Plant Genetics Chromosome theories.—A classic example of the simplest kind is found in the nematode worms. Fig. 39 will indicate how sex is determined in this case. The mechanism is obvious. Both male and female have ten MALE 0000 o • o 00 QO MATURE INDIVIDUALS FEMALE 0000 o^^ o OOP o. 00 00 o • o 00 00 Zygotes 00 00 o# •O 0000 (Thb type of zygote produces a male) (This lype of zygote produces a female) Fig. 39.—Illustrating behavior of sex chromosomes chromosomes to determine most of their somatic char- acters; but in addition the
. Plant genetics . Heredity; Mendel's law; Plant breeding. 178 Plant Genetics Chromosome theories.—A classic example of the simplest kind is found in the nematode worms. Fig. 39 will indicate how sex is determined in this case. The mechanism is obvious. Both male and female have ten MALE 0000 o • o 00 QO MATURE INDIVIDUALS FEMALE 0000 o^^ o OOP o. 00 00 o • o 00 00 Zygotes 00 00 o# •O 0000 (Thb type of zygote produces a male) (This lype of zygote produces a female) Fig. 39.—Illustrating behavior of sex chromosomes chromosomes to determine most of their somatic char- acters; but in addition there are extra chromosomes that determine sex, known variously as sex chromosomes, X chromosomes, and heterochromosomes. In this case the male contains only one sex chromosome while the female contains two. At the reduction division, coimected with gamete formation, the chromosome equipment. 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 Coulter, John Merle, 1851-1928; Coulter, Merle C. (Merle Crowe), 1894-1958. Chicago : The University of Chicago Press
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