GENETICS OF PARAMECIUM BURSARIA. I. MATING TYPES AND GROUPS, THEIR INTERRELATIONS AND DISTRIBUTION; MATING BEHAVIOR AND SELF STERILITY

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Abstract
Ordinarily, members of a single clone in P. bursaria do not conjugate together, but when 3 2 clones are mixed, in some mixtures the individuals clump into dense masses, later emerging as conjugating pairs; in other mixtures clumping and pairing do not occur. The mating behavior is descr. and illustrated. There are 2 main factors a coordinated reaction of 2 individuals that come in contact; and a physical adhesion between bodies that touch. Clones that do not clump and pair together are of the same mating type; those that do, of different types. 16 diverse mating types are found to exist, in 3 groups. Group I contains 4 mating types, group II 8 types, group III 4 types. The members of any single type may mate with those of any of the other types of the same group, but members of different groups do not intercross. The occurrence and distribution in the U. S. of the 3 groups and 16 types are described. Rarely self fertilization occurs within a clone. The relation of the phenomena to multi-polar sex and to self sterility is discussed.

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