The polled locus maps to BTA1 in a Bos indicus x Bos taurus cross

Article Abstract:

The genetic map of bovine chromosome 1 (BTA1) consists of one hundred and forty-two informative meioses per locus and 13 microsatellite loci with 267 informative meioses per locus. Backcrosses and F(sub 2) progeny formed by embryo transfer from Bos taurus and Bos indicus parents are used to locate the polled locus involved in the polled phenotype in a genetic map of BTA1. Scurred and horned phenotypes are difficult to differentiate, indicating that refining the model for the inheritance of horned and scurred phenotypes necessitates bracketing markers.

Embryo transplantation

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High-resolution mapping and genetic characterization of the Lazy-2 gravitropic mutant of tomato

Article Abstract:

Mutation of the Lazy-2 (Lz-2) gene in tomato (Lycopersicon esculentum Mill.) leads to a phytochrome-dependent reversal of shoot gravitropism, providing a genetic resource to study how signals from light modulate gravitropism. The Lz-2 gene was mapped using RFLPs and a PCR-based method to determine the possibility of positional cloning. It is suggested that Lz-2 resides in a centromeric region where recombination is highly suppressed.

Heredity

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Mox: a novel modifier of the tomato Xa locus

Article Abstract:

A novel mutation called Modifier of Xa (Mox) was isolated in an attempt to examine the progeny of plants with Ac elements linked to Xa. The Mox mutation was characterized by xa+ allele duplication and yielded variegation from Ac-induced breakage, eliminating one or both xa+ alleles. The duplication xa+ allele and breakage described Mox phenotypes of modified Xa/xa+ phenotypes.

Variegation, Variegation (Botany), Plant mutation

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