Spontaneous chromosome breakage in hybrid endosperms

Chromosoma ◽  
1956 ◽  
Vol 8 (1) ◽  
pp. 317-340 ◽  
Author(s):  
Alfred Rutishauser ◽  
L. F. La Cour
Keyword(s):  
Chromosome Breakage ◽  
Spontaneous Chromosome

Riyadh Chromosome Breakage Syndrome: Mental Retardation With Depigmentation of the Skin and Hair

1992 ◽  
Vol 7 (1_suppl) ◽  
pp. S79-S82 ◽  
Author(s):  
Pinar T. Ozand ◽  
Manjula Waghray ◽  
Jay D. Cook ◽  
Kirtikant Sheth ◽  
Generoso G. Gascon
Keyword(s):  
Mental Retardation ◽  
Sister Chromatid ◽  
Chromosome Breakage ◽  
Hair Color ◽  
Γ Irradiation ◽  
Exchange Frequency ◽  
Chromosome Breaks ◽  
Chromosome Breakage Syndrome ◽  
Sister Chromatid Exchange Frequency ◽  
Spontaneous Chromosome

A 20-month-old infant with "silvery-blond" hair color, widespread confettilike depigmentation of the skin, and mental retardation was found to have, in lymphocytes and fibroblast cultures, increased spontaneous chromosome breaks and breaks induced by both mitomycin and γ-irradiation. The sister chromatid exchange frequency was normal. This child probably represents a new chromosome breakage syndrome. (J Child Neurol 1992;7(Suppl):S79-S82.)

Fragile sites in chromosomes: possible model for the study of spontaneous chromosome breakage

Science ◽  
1983 ◽  
Vol 220 (4592) ◽  
pp. 69-70 ◽  
Author(s):  
P. Jacky ◽  
B Beek ◽  
G. Sutherland
Keyword(s):  
Chromosome Breakage ◽  
Fragile Sites ◽  
Spontaneous Chromosome

scholarly journals Spontaneous chromosome breakage in natural populations of Najas marina

Hereditas ◽  
2009 ◽  
Vol 88 (2) ◽  
pp. 279-283 ◽  
Author(s):  
Yrjö Viinikka ◽  
Maija Kotimäki ◽  
Kirsi Litmanen
Keyword(s):  
Natural Populations ◽  
Chromosome Breakage ◽  
Najas Marina ◽  
Spontaneous Chromosome

The meiotic consequences of spontaneous Chromosome breakage

Chromosoma ◽  
1966 ◽  
Vol 18 (2) ◽  
pp. 287-304 ◽  
Author(s):  
K. R. Lewis ◽  
B. John
Keyword(s):  
Chromosome Breakage ◽  
Spontaneous Chromosome

A case of spontaneous chromosome breakage at a specific locus occurring at meiosis

1966 ◽  
Vol 14 (6) ◽  
pp. 1027 ◽  
Author(s):  
MJD White
Keyword(s):  
Natural Populations ◽  
Chromosome Breakage ◽  
Acentric Fragment ◽  
Single Male ◽  
Causal Explanations ◽  
Male Individual ◽  
Large Pair ◽  
Spontaneous Chromosome ◽  
Specific Locus ◽  
The One

The undescribed species of grasshopper PW21 (Orthoptera: Eumastacidae: Morabinae) from northern Australia has been found to exhibit three different karyotypes in its natural populations. Two of these have 2nB = 13, the third has 2nB = 15. Males are invariably XO, but the X may be either acrocentric or metacentric. The relation between the 13-chromosome karyotypes and the 15-chromosome one is complex. In a single male individual of the 15-chromosome population (out of four examined cytologically) one of the large pair of metacentric chromosomes regularly undergoes fragmentation at a locus close to the centromere just before first metaphase. The acentric fragment is caught up in the spindle but frequently travels to the "wrong" pole at first anaphase. Possible causal explanations of this phenomenon are discussed. These include the one-locus hypothesis ("suicide" of a chromosome) and various two-locus hypotheses ("murder" of one chromosome by another).

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