Fechheimer NS

PubMed

Directory of Open Access Journals

regions of chromosomes such as the centromere and telomere in cattle, goat and  horse; centro-mere and « secondary constriction » in pig; satellite in cat.  However, polymorphism in occur-rence of N  bands was observed.Influence of the NaH,P0 4   incubation on the discovering of N  bands in the fresh and oldslides was observed.  Staining procedure for C banding has been used for the comparison ofresults.Frequency and source of chromosome abnormalitiesin chick embryosN. S. FECHHEIMERDairy  Science  Department,  The  Ohio  State  University,Columbus, Ohio &cent; 32 zo  (U.S.A.)In a  series of nine studies, 8 25 8  chicken embryos  have  been examined  for the occurrence  ofchromosomal abnormalities.  Eggs were incubated for only 1 6  to 1 8  hours before the embryos,in the primitive streak stage, were removed.  Preparations for karyological examination weremade from cell suspensions of each embryo.  The overall incidence of embryos with aberra-tions was 49   p. 1 , 000   but there were large and significant differences between stocks of broiler-type (BR) and Leghorn-type (LG).  BR  contained 102   p.  i ooo, LG  contained 14 . 1   p. 1000   andembryos  from  crosses between  the two  contained  q6 p. 1000 .  The  most  frequently  occuring  typesof abnormalities were haploidy (including haploid-diploid chimerics), polyploidy, diploid-tetra-ploid mosaics and pure aneuploidy.  Their incidences per i,ooo in BL, LG  and crosses respecti-vely were 54 ,  3 ,  19   for haploidy; m, 6, g for polyploidy; 1 6, r, 5  for diploid-tetraploid mosaics;6, 3 ,  and 9   for aneuploidy.  The parental source of each of the primary types of abnormalitieshas  been  determined and  the  place  in the  reproductive  cycle where  errors occur  giving  rise to eachhas been established.

Genetics Selection Evolution

Frequency and source of chromosome abnormalities in chick embryos

NS Fechheimer

Springer - Publisher Connector

N. S. FECHHEIMER

EDP Sciences OAI-PMH repository (1.2.0)

Frequency and source of chromosome abnormalities  in chick embryos

Crossref

regions of chromosomes such as the centromere and telomere in cattle, goat and horse; centro-
mere and « secondary constriction » in pig; satellite in cat. However, polymorphism in occur-
rence of N bands was observed.
Influence of the NaH,P04incubation on the discovering of N bands in the fresh and old
slides was observed. Staining procedure for C banding has been used for the comparison of
results.
Frequency and source of chromosome abnormalities
in chick embryos
N. S. FECHHEIMER
Dairy Science Department, The Ohio State University,
Columbus, Ohio &cent;32zo (U.S.A.)
In a series of nine studies, 8 258 chicken embryos have been examined for the occurrence of
chromosomal abnormalities. Eggs were incubated for only 16 to 18 hours before the embryos,
in the primitive streak stage, were removed. Preparations for karyological examination were
made from cell suspensions of each embryo. The overall incidence of embryos with aberra-
tions was 49 p. 1,000 but there were large and significant differences between stocks of broiler-
type (BR) and Leghorn-type (LG). BR contained 102 p. i ooo, LG contained 14. p. 1000 and
embryos from crosses between the two contained q6 p. 1000. The most frequently occuring types
of abnormalities were haploidy (including haploid-diploid chimerics), polyploidy, diploid-tetra-
ploid mosaics and pure aneuploidy. Their incidences per i,ooo in BL, LG and crosses respecti-
vely were 54, 3, 19 for haploidy; m, 6, g for polyploidy; 16, r, 5 for diploid-tetraploid mosaics;
6, 3, and 9 for aneuploidy. The parental source of each of the primary types of abnormalities
has been determined and the place in the reproductive cycle where errors occur giving rise to each
has been established.


file:///data/remote/core/dit/data/Springer-OA/pdf/d3a/aHR0cDovL2xpbmsuc3ByaW5nZXIuY29tLzEwLjExODYvMTI5Ny05Njg2LTktNC01NDEucGRm.pdf

Frequency and source of chromosome abnormalities in chick embryos

Abstract

Similar works

Full text

Available Versions

Directory of Open Access Journals

Springer - Publisher Connector

EDP Sciences OAI-PMH repository (1.2.0)

Crossref

Springer - Publisher Connector