An international consortium has launched the whole-genome sequencing of potato, the fourth most important food crop in the world. Construction of genetic linkage maps is an inevitable step for taking advantage of the genome projects for the development of novel cultivars in the autotetraploid crop species. However, linkage analysis in autopolyploids, the kernel of linkage map construction, is t...

Intra- and interspecific cross combinations between the tetraploid treefrog Hyla versicolor, and between H. versicolor and the diploid treefrog Hyla chrysoscelis were performed. Progeny phenotypes resulting from these crosses were examined electrophoretically using a polymorphic glutamate oxaloacetic transaminase (GOT-1) locus, to determine the mechanism of chromosome segregation in H. versicol...

Arachis hypogaea L. (cultivated peanut) is an allotetraploid (2n = 4x = 40) with an AABB genome type. Based on cytogenetic studies it has been assumed that peanut and wild-derived induced AABB allotetraploids have classic allotetraploid genetic behavior with diploid-like disomic recombination only between homologous chromosomes, at the exclusion of recombination between homeologous chromosomes....

Gene-dosage responses for a group of six wheat endosperm proteins have been investigated by using compensated nulli-tetrasomic lines of cv. Chinese Spring. Practically linear dosage responses have been observed for all the proteins. However, for two of the proteins (and probably for a third one), the net output of protein, at each dosage of its structural gene, was 30-80% higher when the chromo...

DROSOPHILA with one more or less 4th chromosome than the normal pair were first described by BRIDGES ( 1921a,b). Haplo-4 flies with only one 4th chromosome were discovered because of their obvious complex of abnormal characters. Most conspicuously they are Minute; that is they have short slender bristles. Triplo-4 flies do not differ greatly from normal flies in phenotype, but according to BRID...

ankyloglossia (tongue-tie) is a congenital anomaly with a prevalence of 4-5% and characterized by an abnormally short lingual frenulum. for unknown reasons the abnormality seems to be more common in males. the pathogenesis of ankyloglossia is not known. the authors report a family with isolated ankyloglossia inherited as an autosomal dominant or recessive trait. the identification of the defect...

idiopathic hypercalciuria is a leading cause of frequency-dysuria syndrome in childhood. different modes of inheritance have been suggested in this disease. this article presents the occurrence of idiopathic hypercalciuria in all children of two families. in the first family, a 5.5 year old girl with a history of renal stones and dysuria due to hypercalciuria, had two involved brothers and one ...