Analysis of synaptonemal complexes in two fertile heterozygous boars, both carriers of a reciprocal translocation involving an acrocentric chromosome

1989 ◽  
Vol 50 (4) ◽  
pp. 220-225 ◽  
Author(s):  
H. Jaafar ◽  
O. Gabriel-Robez ◽  
C. Ratomponirina ◽  
J. Boscher ◽  
M. Bonneau ◽  
...  
Keyword(s):  
Reciprocal Translocation ◽  
Acrocentric Chromosome ◽  
Synaptonemal Complexes

THREE NEW CHROMOSOMAL TRANSLOCATIONS IN HAWORTHIA

1968 ◽  
Vol 10 (3) ◽  
pp. 487-494 ◽  
Author(s):  
Herbert P. Riley ◽  
S. K. Majumdar
Keyword(s):  
Reciprocal Translocation ◽  
Acrocentric Chromosome ◽  
Centric Fusion ◽  
Metacentric Chromosome ◽  
Chromosomal Translocations ◽  
Short Chromosome ◽  
Acrocentric Chromosomes ◽  
Fusion Type

In one plant of a small-leaved form of Haworthia glauca a centric fusion type of reciprocal translocation was found between two long chromosomes with subterminal centromeres that interchanged to form a long metacentric and a short acrocentric chromosome; the latter is larger than the normal short chromosomes of the complement and consists of the short arms of the two original long chromosomes. In a typical plant of the same species a similar interchange was followed or accompanied by a second interchange between the short translocation chromosomes and a normal short chromosome to form a somewhat intermediate-sized acrocentric and a very short metacentric chromosome. In a plant of H. fulva a long and a short chromosome interchanged to produce two intermediate-sized acrocentric chromosomes. Possible evolutionary implications of these interchanges are discussed.

Centromere orientation at metaphase I of a translocation heterozygote in lentil

1983 ◽  
Vol 25 (6) ◽  
pp. 547-553 ◽  
Author(s):  
Frida Buruchin ◽  
G. Ladizinsky
Keyword(s):  
Reciprocal Translocation ◽  
Acrocentric Chromosome ◽  
Similar Length ◽  
Translocation Heterozygote ◽  
Ring Bivalents ◽  
Acrocentric Chromosomes ◽  
Number Of Cells ◽  
Metaphase I

Reciprocal translocation between submetacentric and acrocentric chromosomes of lentil was studied. This interchange did not entail karyotypic changes. Two homomorphic ring bivalents produced by the four chromosomes of the translocation complex indicated that the long arm of the acrocentric chromosome was involved in the interchange. Chiasmata distribution in the native arms, the translocated and interstitial segments in bivalents and quadrivalents, was taken as an indication for two pairing pattern in the translocation complex. Chiasma terminalization in the short arm of the acrocentric chromosome of the translocation complex was faster in bivalents than in quadrivalents. The overwhelming number of cells with alternate-1 compared with alternate-2 orientation was attributed to the similar length of the zigzag diagonals of alternate-1 that apparently induced greater stability. The necessary elements for adjacent-2 orientation were available in the examined material but were practically absent. Pole–centromere specificity was proposed for explaining the absence of adjacent-2 in the present and other studies and the orientation of homologous centromeres to opposite poles even when they were located in different bivalents.

scholarly journals Chromosomal anomalies that cause male sterility in the mouse also reduce ovary size

1984 ◽  
Vol 44 (2) ◽  
pp. 219-224 ◽  
Author(s):  
Ursula Mittwoch ◽  
Shantha Mahadevaiah ◽  
Leslie A. Setterfield
Keyword(s):  
Male Sterility ◽  
Germ Cells ◽  
Reciprocal Translocation ◽  
Chromosomal Anomalies ◽  
Male Sterile ◽  
Chromosome Anomalies ◽  
Ovarian Size ◽  
Males And Females ◽  
The Difference ◽  
Ovarian Involvement

SUMMARYTwo male-sterile chromosome anomalies, the insertion Is(7; 1)40H and the tertiary trisomy, Ts(512)31H, were found to be associated with reduced ovarian volumes in immature females. Together with the reciprocal translocation, T(11; 19)42H, in which this effect was described previously, reduced ovaries have been found in all three male-sterile chromosome anomalies investigated so far, suggesting that ovarian involvement is likely to be common in these conditions. Assuming that the smaller ovarian size reflects a reduction in the number of oocytes, it is suggested that male-sterile chromosome anomalies may exert basically similar deleterious effects on meiotic germ cells in males and females, the difference in outcome being due to cell-physiological differences between spermatocytes and oocytes and to the small number of surviving oocytes required for fertility in females.

Reciprocal translocation (13;20)(q12;q22) in an Icelandic sheep

1992 ◽  
Vol 52 (3) ◽  
pp. 367-370 ◽  
Author(s):  
K. Anamthawat-Jonsson ◽  
S.E. Long ◽  
P.K. Basrur ◽  
S. Adalsteinsson
Keyword(s):  
Reciprocal Translocation ◽  
Icelandic Sheep
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