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The genetics of mating type in the suctorian Tokophrya lemnarum

Published online by Cambridge University Press:  14 April 2009

Laura Ann Colgin-Bukovsan
Laura Ann Colgin-Bukovsan
Affiliation:
Contribution No. 1005 from the Department of Zoology, Indiana University, Bloomington, Indiana, U.S.A.

Summary

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The two clones produced by the two members of a conjugating pair are normally of the same mating type, about 50% of such synclones being mating type I, 50% type II. This ratio suggests (1) that mating type is determined by a pair of alleles at one locus or by a pair of mating type determining chromosomes, and (2) that one mating type is homozygous, the other heterozygous or hemizygous. Mating type ratios are unaffected by temperature or parental age. Exceptions are of three types: (1) mates that produce one clone of type I, the other of type II, (2) mates which fuse permanently and yield a clone pure for either mating I or mating type II, and (3) conjugation of three mates one of which is regularly non-viable, the two survivors producing either two clones of type I, two clones of type II or one of each type. The bases of these exceptional results remain obscure.

Type
Research Article
Information
Genetics Research , Volume 27 , Issue 2 , April 1976 , pp. 303 - 314
Copyright
Copyright © Cambridge University Press 1976

References

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