Banta, Arthur Mangun, Snider, Kathleen Gavin, Wood, Thelma Rittenhouse (1926) Inheritance in parthenogenesis and in sexual reproduction in a Cladoceran. Proceedings of the Society for Experimental Biology and Medicine, 23. pp. 621-622.
Abstract
For some years we have been making studies with Cladocera on the occurrence of mutations and their inheritance in parthenogenesis. Four mutant characters have been studied in Daphnia longispina. The inheritance is complete, since every parthenogenetic young from a mutant individual genetically possesses the mutant character (except, of course, for the occasional interference of another mutation). This is in accord with expectation, in view of the absence of chromatic reduction and segregation in the maturation of the parthenogenetic (diploid) eggs in Cladocera. It was of further interest to obtain, if possible, sexual reproduction and hybrid offspring between mutant clones and the “wild” type. Sexual eggs (haploid and requiring fertilization) are frequently obtainable, and males may usually be obtained when desired, but it is not easy to obtain, simultaneously, ovarian sexual eggs and functional males from just the stocks desired. When sexual eggs and active males are obtained at the same time, fertilization frequently does not occur, and the fertilized eggs when obtained give exceedingly poor hatches, so that many fruitless attempts preceded the obtaining of the desired hybrids. Forty hybrids have been or are now being studied and some data obtained on the inheritance of the two mutant characters involved in the stock used in the crosses. The characters involved are sex-intergradedness and “excavated” head. Twenty-nine of these hybrids are from wild type × mutant , and 11 are from the reciprocal cross. Nineteen of these hybrids genetically possess the mutant character, excavated head, and 19 show sex intergradedness. It seems probable, therefore, that each of these characters is a dominant mendelian character and is heterozygous in the mutant clones used in the crosses. Further breeding and study will be necessary before the full extent of the inheritance of these characters is determined.
| Item Type: | Paper |
|---|---|
| Subjects: | organism description > animal |
| CSHL Authors: | |
| Communities: | The Carnegie Institution Department of Genetics |
| Depositing User: | Elizabeth Pessala |
| Date: | 1926 |
| Date Deposited: | 10 Oct 2016 17:16 |
| Last Modified: | 20 Dec 2016 15:59 |
| URI: | https://repository.cshl.edu/id/eprint/33588 |
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