Length polymorphism in the ribosomal DNA intergenic spacer of rye and slender wild oats

Article Abstract:

A study conducted on genetic variation in Spanish populations of three species of rye and two species of oats shows that variation in the ribosomal DNA spacer length is seen in all the species. The copy number of the space variants in the rye species is more than that in Canadian populations. The size and structure of the subrepeat in the intergenic spacer has been conserved after the polyploidization that produced the Avena barbata species of oat. Since oats are self-fertilizing the genetic variation is mainly due to homozygous genotypes rather than heterozygosity.

Plant molecular genetics, Oats, Rye

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Polymorphism of alpha1-antitrypsin in North American species of Canis

Article Abstract:

Alpha1-Antirypsin (A1AT) is a protease inhibitor in all mammalian sera. Canine A1AT has been isolated and characterized by Abrams and colleagues. Previously reported A1AT polymorphism in domestic dogs comprised two alleles PiM and Pis. Gray wolves, Mexican wolves, coyotes, wolf-dog crosses and red wolves were tested for A1AT polymorphism. Allele frequencies for domestic dogs and gray wolves were similar. Mexican wolves had much lower frequency of Pis and coyotes and red wolves were monomorphic for the Pis allele.

Wolves

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Possible genetic basis of pederin polymorphism in rove beetles

Article Abstract:

In rove beetles Paederus riparius, (+) females can biosynthesize the hemolymph toxin pederin and (-) females without this ability. They co-occur in natural populations. Larvae from both types were reared and imagoes were crossed to provide information about the possible genetic basis of the polymorphism. A matrilineal trait is suggested.

Beetles

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