Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 7-Day Trial for You or Your Team.

Learn More →

Genetics of Daphnia obtusa: Genetic Load and Linkage Analysis in a Cyclical Parthenogen

Genetics of Daphnia obtusa: Genetic Load and Linkage Analysis in a Cyclical Parthenogen Abstract Inbred and outbred progeny were used to assess the presence of genetic load among clones of the cyclically parthenogenetic cladoceran Daphnia obtuse. The average proportion surviving was significantly lower (0.43 ± SE 0.05) for progeny from 18 self-mated clones than for progeny from five outcrossed matings (0.88 ± 0.06). The variation in survival among self-mated clones (0.13 to 0.92) suggested that genetic load varies among clones and may be related to the age of each clone. Inbred progeny from two clones exhibited slower growth and an increased variation in growth compared to outbred progeny from the cross between the two clones. Genotyplc segregation ratios were tested in the selfed progeny of 14 clones heterozygous for one or more enzyme loci. Seven (25%) of the 28 tests at individual loci showed significant deviations from the expected 1:2:1 ratio among the three genotypes. Deviations were caused by a deficiency of one of the homozygous classes, suggesting the presence of linked recessive deleterious genes. Information on recombination among three enzyme loci revealed two linkage groups consisting of Pgm-Amy (recombination fraction 0.15 ± 0.04) and Got. Recombination was found to occur in both sexes. This content is only available as a PDF. © 1989 The American Genetic Association http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Heredity Oxford University Press

Genetics of Daphnia obtusa: Genetic Load and Linkage Analysis in a Cyclical Parthenogen

Innes, D., J.
Journal of Heredity , Volume 80 (1) – Jan 1, 1989
Download PDF
5 pages

Loading next page...
 
/lp/oxford-university-press/genetics-of-daphnia-obtusa-genetic-load-and-linkage-analysis-in-a-r5nk65izjs

References (0)

References for this paper are not available at this time. We will be adding them shortly, thank you for your patience.

Publisher
Oxford University Press
Copyright
© 1989 The American Genetic Association
ISSN
0022-1503
eISSN
1465-7333
DOI
10.1093/oxfordjournals.jhered.a110791
Publisher site
See Article on Publisher Site

Abstract

Abstract Inbred and outbred progeny were used to assess the presence of genetic load among clones of the cyclically parthenogenetic cladoceran Daphnia obtuse. The average proportion surviving was significantly lower (0.43 ± SE 0.05) for progeny from 18 self-mated clones than for progeny from five outcrossed matings (0.88 ± 0.06). The variation in survival among self-mated clones (0.13 to 0.92) suggested that genetic load varies among clones and may be related to the age of each clone. Inbred progeny from two clones exhibited slower growth and an increased variation in growth compared to outbred progeny from the cross between the two clones. Genotyplc segregation ratios were tested in the selfed progeny of 14 clones heterozygous for one or more enzyme loci. Seven (25%) of the 28 tests at individual loci showed significant deviations from the expected 1:2:1 ratio among the three genotypes. Deviations were caused by a deficiency of one of the homozygous classes, suggesting the presence of linked recessive deleterious genes. Information on recombination among three enzyme loci revealed two linkage groups consisting of Pgm-Amy (recombination fraction 0.15 ± 0.04) and Got. Recombination was found to occur in both sexes. This content is only available as a PDF. © 1989 The American Genetic Association

Journal

Journal of Heredity – Oxford University Press

Published: Jan 1, 1989

There are no references for this article.