A Robertsonian polymorphism in pink salmon ( Oncorhynchus gorbuscha) involving the nucleolar organizer region
A chromosome polymorphism involving a Robertsonian rearrangement has been found for two consecutive years in pink salmon from Lake Superior. Although the majority of the fish have a diploid number of 52, as previously reported for Oncorhynchus gorbuscha, 10–15% of the population have 2n = 53, in whi...
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Format: | Article in Journal/Newspaper |
Language: | English |
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S. Karger AG
1987
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Online Access: | http://dx.doi.org/10.1159/000132363 https://www.karger.com/Article/Pdf/132363 |
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crskarger:10.1159/000132363 2024-06-16T07:42:30+00:00 A Robertsonian polymorphism in pink salmon ( Oncorhynchus gorbuscha) involving the nucleolar organizer region Phillips, R.B. Kapuscinksi, A.R.D. 1987 http://dx.doi.org/10.1159/000132363 https://www.karger.com/Article/Pdf/132363 en eng S. Karger AG https://www.karger.com/Services/SiteLicenses https://www.karger.com/Services/SiteLicenses Cytogenetic and Genome Research volume 44, issue 2-3, page 148-152 ISSN 1424-8581 1424-859X journal-article 1987 crskarger https://doi.org/10.1159/000132363 2024-05-22T12:59:45Z A chromosome polymorphism involving a Robertsonian rearrangement has been found for two consecutive years in pink salmon from Lake Superior. Although the majority of the fish have a diploid number of 52, as previously reported for Oncorhynchus gorbuscha, 10–15% of the population have 2n = 53, in which one of the metacentric chromosomes has apparently undergone fission. The chromosome pair involved is the pair which contains the nucleolar organizer region (NOR) which is normally found adjacent to the centromere. In all of the individuals with 53 chromosomes, there is a small, acrocentric chromosome representing the short arm of the normal metacentric and a slightly larger, submetacentric chromosome with the NOR on its short arms. This chromosome apparently represents the long arm of the original metacentric in which the NOR has been rearranged to the other side of the centromere. Analysis of artificially induced haploid embryos as well as normal diploid embryos from females with 53 chromosomes suggests that meiotic chromosomes undergo alternate disjunction so that only balanced gametes are produced. Article in Journal/Newspaper Oncorhynchus gorbuscha Pink salmon Karger Long Arm ENVELOPE(-55.648,-55.648,49.517,49.517) Cytogenetic and Genome Research 44 2-3 148 152 |
institution |
Open Polar |
collection |
Karger |
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crskarger |
language |
English |
description |
A chromosome polymorphism involving a Robertsonian rearrangement has been found for two consecutive years in pink salmon from Lake Superior. Although the majority of the fish have a diploid number of 52, as previously reported for Oncorhynchus gorbuscha, 10–15% of the population have 2n = 53, in which one of the metacentric chromosomes has apparently undergone fission. The chromosome pair involved is the pair which contains the nucleolar organizer region (NOR) which is normally found adjacent to the centromere. In all of the individuals with 53 chromosomes, there is a small, acrocentric chromosome representing the short arm of the normal metacentric and a slightly larger, submetacentric chromosome with the NOR on its short arms. This chromosome apparently represents the long arm of the original metacentric in which the NOR has been rearranged to the other side of the centromere. Analysis of artificially induced haploid embryos as well as normal diploid embryos from females with 53 chromosomes suggests that meiotic chromosomes undergo alternate disjunction so that only balanced gametes are produced. |
format |
Article in Journal/Newspaper |
author |
Phillips, R.B. Kapuscinksi, A.R.D. |
spellingShingle |
Phillips, R.B. Kapuscinksi, A.R.D. A Robertsonian polymorphism in pink salmon ( Oncorhynchus gorbuscha) involving the nucleolar organizer region |
author_facet |
Phillips, R.B. Kapuscinksi, A.R.D. |
author_sort |
Phillips, R.B. |
title |
A Robertsonian polymorphism in pink salmon ( Oncorhynchus gorbuscha) involving the nucleolar organizer region |
title_short |
A Robertsonian polymorphism in pink salmon ( Oncorhynchus gorbuscha) involving the nucleolar organizer region |
title_full |
A Robertsonian polymorphism in pink salmon ( Oncorhynchus gorbuscha) involving the nucleolar organizer region |
title_fullStr |
A Robertsonian polymorphism in pink salmon ( Oncorhynchus gorbuscha) involving the nucleolar organizer region |
title_full_unstemmed |
A Robertsonian polymorphism in pink salmon ( Oncorhynchus gorbuscha) involving the nucleolar organizer region |
title_sort |
robertsonian polymorphism in pink salmon ( oncorhynchus gorbuscha) involving the nucleolar organizer region |
publisher |
S. Karger AG |
publishDate |
1987 |
url |
http://dx.doi.org/10.1159/000132363 https://www.karger.com/Article/Pdf/132363 |
long_lat |
ENVELOPE(-55.648,-55.648,49.517,49.517) |
geographic |
Long Arm |
geographic_facet |
Long Arm |
genre |
Oncorhynchus gorbuscha Pink salmon |
genre_facet |
Oncorhynchus gorbuscha Pink salmon |
op_source |
Cytogenetic and Genome Research volume 44, issue 2-3, page 148-152 ISSN 1424-8581 1424-859X |
op_rights |
https://www.karger.com/Services/SiteLicenses https://www.karger.com/Services/SiteLicenses |
op_doi |
https://doi.org/10.1159/000132363 |
container_title |
Cytogenetic and Genome Research |
container_volume |
44 |
container_issue |
2-3 |
container_start_page |
148 |
op_container_end_page |
152 |
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1802009984757661696 |