Abstract
In all adult males and females of T. cristatus most of the long arm of chromosome 1 is achiasmate and heteromorphic with respect to Giemsa C-staining pattern. This heteromorphism correlates well with the heteromorphism seen by previous investigators on the lampbrush chromosomes of adult females. The heteromorphism has nothing to do with sex determination. All those fertile eggs of T. cristatus that develop normally beyond blastula are capable of development through to late tail-bud stage, but 50% of them arrest at late tail-bud and ultimately die. Homomorphism for the long arm of chromosome 1 can only be found in those embryos that arrest at late tailbud. The same findings apply to T. marmoratus, which also shows heteromorphism for chromosome 1, but not to T. alpestris, which has homomorphic chromosomes 1 and a potential 100% developmental success rate.
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Macgregor, H.C., Horner, H. Heteromorphism for chromosome 1, a requirement for normal development in crested newts. Chromosoma 76, 111–122 (1980). https://doi.org/10.1007/BF00293412
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DOI: https://doi.org/10.1007/BF00293412