scholarly journals Cytogenetics of the Brazilian whiptail lizard Cnemidophorus littoralis (Teiidae) from a restinga area (Barra de Maricá) in Southeastern Brazil

2004 ◽  
Vol 64 (3b) ◽  
pp. 661-667 ◽  
Author(s):  
D. Peccinini-Seale ◽  
C. F. D. Rocha ◽  
T. M. B. Almeida ◽  
A. F. B. Araújo ◽  
M. A. De Sena
Keyword(s):  
New Species ◽  
Sex Determination ◽  
Diploid Number ◽  
Nucleolar Organizer ◽  
Southeastern Brazil ◽  
Nucleolar Organizer Regions ◽  
Interphase Nuclei ◽  
Determination Mechanism ◽  
A New Species ◽  
Chromosomal Sex Determination

Chromosomes of Cnemidophorus littoralis, a new species of teiid lizard recently described, were studied. The animals are from a restinga area in Barra de Maricá, RJ. The karyotype presents a diploid number of 2n = 46 chromosomes and a chromosomal sex determination mechanism of the type XX:XY. Nucleolar organizer regions, Ag-NORs, are at the sixth pair of chromosomes; there is variability of size and number of the Ag-stained nucleoli on the 50 interphase nuclei for each specimen analyzed. These nucleoli are related to NOR patterns that also demonstrated variability in size and number. This paper presents the first description of the karyotype of Cnemidophorus littoralis and of a chromosomal sex determination mechanism of the XX:XY type in the genus Cnemidophorus from Southeastern Brazil.

Chromosomal Sex Determination of the Prostate

1958 ◽  
Vol 79 (5) ◽  
pp. 878-881 ◽  
Author(s):  
Harold G. Kudish ◽  
Harry M. Bauer
Keyword(s):  
Sex Determination ◽  
Chromosomal Sex Determination

Chromosomal sex determination and heterochromatin structure in date palm

1996 ◽  
Vol 9 (3) ◽  
pp. 127-132 ◽  
Author(s):  
S. Siljak-Yakovlev ◽  
S. Benmalek ◽  
M. Cerbah ◽  
T. Coba de la Peña ◽  
N. Bounaga ◽  
...  
Keyword(s):  
Sex Determination ◽  
Date Palm ◽  
Heterochromatin Structure ◽  
Chromosomal Sex Determination

Chromosomal sex determination in aphids controlled by juvenile hormone

Genome ◽  
1987 ◽  
Vol 29 (1) ◽  
pp. 107-109 ◽  
Author(s):  
Dinah F. Hales ◽  
Thomas E. Mittler
Keyword(s):  
Sex Determination ◽  
Juvenile Hormone ◽  
Key Words ◽  
Low Temperatures ◽  
High Titre ◽  
Corpus Allatum ◽  
Hormone Concentration ◽  
Hormone Analogue ◽  
X Chromosomes ◽  
Chromosomal Sex Determination

Parthenogenetically reproducing aphids give birth to males in response to low temperatures and short photoperiods. Since female aphids are XX and males are XO, the apomictic production of male eggs requires the elimination of one of the X chromosomes. Our previous experiments had suggested that male eggs were produced when the concentration of juvenile hormone was low; we now confirm this by showing that the juvenile hormone analogue kinoprene prevents ovulation of male eggs in aphids whose corpus allatum has been destroyed by precocene. Juvenile hormone concentration thus influences the behaviour of the X chromosomes during the maturation division of the eggs, a high titre resulting in the retention of both X chromosomes and a low titre in the elimination of one of them. Key words: sex determination, aphids, juvenile hormone, precocene, parthenogenesis.

Chromosomal sex determination system in brachyurans and its potential application in aquaculture

Aquaculture ◽  
2021 ◽  
pp. 736990
Author(s):  
Khor Waiho ◽  
Hanafiah Fazhan ◽  
Mhd Ikhwanuddin ◽  
Emilia T. Quinitio ◽  
Juliana C. Baylon ◽  
...  
Keyword(s):  
Sex Determination ◽  
Potential Application ◽  
Determination System ◽  
Sex Determination System ◽  
Chromosomal Sex Determination

scholarly journals Evolution of dosage compensation in Anolis carolinensis , a reptile with XX/XY chromosomal sex determination

2016 ◽  
pp. evw263 ◽  
Author(s):  
Shawn M. Rupp ◽  
Timothy H. Webster ◽  
Kimberly C. Olney ◽  
Elizabeth D. Hutchins ◽  
Kenro Kusumi ◽  
...  
Keyword(s):  
Sex Determination ◽  
Dosage Compensation ◽  
Anolis Carolinensis ◽  
Chromosomal Sex Determination
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