Mapping the Horns (Ho) locus in sheep: a further locus controlling horn development in domestic animals

Article Abstract:

The presence or absence of horns in Merino sheep is controlled by the expression of the Ho gene. An analysis of a crossbreed of horned Merino rams and hornless polled New Zealand Romney ewes shows that horn development is controlled by two loci. The Ho locus is present on the sheep chromosome OOV10 and has no effect on fleece characteristics. It is probably orthologous to the african horn locus. The HH1 locus also determines horn development and has pleiotropic effect on the fleece. It is probably present on the sheep chromosome OOV1 and may be orthologous to the polled locus of cattle.

Horns, Horns (Anatomy)

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Testing for linkage between a marker locus and a major gene locus in half-sib families

Article Abstract:

Large half-sibling families, generated by mating one male to many females, are used to study methods for analyzing the linkage between a marker locus and a major gene locus. Diallelic systems with unequal gene frequencies of the marker allels in the dam population may be best studied by using all the progeny instead of just using progeny that can be assigned as being recombinant or nonrecombinant. Moreover, lack of dam marker information does not significantly affect genotype information.

Genotype, Genotypes, Allelomorphism, Alleles

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An autosomal genetic linkage map of the sheep genome

Article Abstract:

The AgResearch International Mapping Flock is a set of nine sheep pedigrees that covers 2070 of the sheep genome. The extensive ovine genetic linkage map covered 246 polymorphic markers in nine three-generation full-sib pedigrees. Unlinked markers showed heterozygous males with autosomal or pseudoautosomal origins. The maximum number of informative meioses for the map was 222, with 140 as an average number per marker.

Chromosome mapping

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