GLOSSARY 



SEN3ILLAE, the sense organs of touch in insects, 

 particularly hairs and cones. 



SEX-MOSAIC, an individual that is part one sex 

 and part . the other. Tn Habrobracon, sex 

 mosaics are part haploid and part diploid. 



SIBS, related individuals , particularly brothers 

 and sisters. 



SINGLES, a term applied to genotypes resulting 

 from one crossover, and to the individuals 

 possessing them. 



SOMATIC OVERLAPPING, the intergrading of one 

 phenotype into another so that neither are 

 clearly distinguishable. 



STEMMATICUM, the triangular patch between the 

 . simple eyes or ocelli of an insect. 



STERNITE, an area of chitinization in an insect 

 sternum. 



STERNUM, the ventral division of an insect 

 segment. 



STIGMA, a thickened, opaque spot on the anteri- 

 or margin of the primary v/ing of an insect. 



STING, a pointed, hollow, needle-like organ at 

 the posterior end of the abdomen in cer- 

 tain female insects; for example, bees and 

 wasps . 



STOCK, organisms reared and cared for for ex- 

 perimental purposes. 



STRAIGHTS, gametes containing genes in the same 

 combinations that were present in the par- 

 ents; the opposite of crossovers. 



SYNAPSIS, the conjugation of pairs of homologous 

 chromosomes in meiosis. 



SYNCYTIUM, a mass of protoplasm in which the 

 nuclei are free and not separated from 

 each other by cell membranes or walls, 



SYNCAMY, the union of gametes o 



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