Cytology and reproduction of Paspalum densum and its genomic relationship with P. intermedium and P. urvillei

Article Abstract:

A diploid, sexual, highly self incompatible Paspalum densum from Bolivia is regarded as a secondary gene source for genetic improvement of Vaseygrass when it is crossed with a diploid cyclotype of P. intermedium and with allotetraploid Vaseygrass, Paspalum urvillei. Meiosis in the P. densum crossed with P. intermedium hybrids was regular, and the mean chromosome association of 0.7 univalents and 9.64 bivalents per pollen mother cell suggests that these species are closely related and share the same 1 genome.

Usage, Grasses, Forage plants

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Centric fusion polymorphisms in waterbuck (Kobus ellipsiprymnus)

Article Abstract:

A study showed that 26 individuals of the ellipsiprymnus subspecies group of Kobus ellipsiprymnus had chromosomal complements of 2n=50-52 (FN+61-62) and 26 of the defassa subspecies group had complements of 2n=53-54 (FN=62). Variation in diploid number was the result of polymorphism for two independent centric fusions. Findings indicated that the Y chromosome was acrocentric in the ellipsiprymnus group and submetacentric in the defassa group which may be a result of a pericentric inversion.

Genetic polymorphisms, Bovidae

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Genetic and physical mapping of the chicken IGF1 gene to chromosome 1 and conservation of synteny with other vertebrate genomes

Article Abstract:

The fluorescent in situ hybridization and fractional length measurements of unbanded chromosomes indicate that the chicken insulin-like growth factor 1 (IGF1) locus is at the short arm chromosome near the centromere. The IGF1 and GAPD loci are on either side of the centromere, on the short and long arms. The loci are syntenic on other vertebrate chromosomes indicating that syntenic group has been retained since the divergence of mammals and birds from a common ancestor.

Observations, Laboratory animals, Chickens, Insulin-like growth factor 1, Insulin-like growth factor I, Chickens as laboratory animals

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