Claim · model-written summary
Larger 12–18 chromosome rings had irregular segregation and high sterility.
- Taxon
- Clarkia dudleyana
Clarkia dudleyanat0 - Outcome
- segregation is much more irregular and leads to high sterilitye0
- Qualifier
- 12 to 18 chromosomese0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the larger rings of 12 to 18 chromosomes, derived from interpopulation crosses, segregation is much more irregular and leads to high sterility.”
t0“CLARKIA DUDLEYANA”
Title
CHROMOSOMAL DIFFERENTIATION IN CLARKIA DUDLEYANA
Richard Snow American Journal of Botany 1960. doi:10.1002/j.1537-2197.1960.tb07129.x
Other claims from this paper (13)
- Observation Clarkia dudleyana had n=9 chromosomes.
- Observation Seventeen point one percent of 275 individuals were reciprocal-translocation heterozygotes.
- Observation Supernumerary chromosomes occurred in about 2% of examined plants.
- Observation Translocation heterozygotes clustered near the center of the species range.
- Observation One colony had 69% heterozygotes among 42 plants.
- Observation At least five chromosome arrangements were present in that locality.
- Observation Hybrids between colonies were invariably translocation heterozygotes.
- Observation The largest hybrid chromosome association was a chain of all 18 chromosomes.
- Association Geographic separation showed no correlation with cytological differentiation.
- Observation Heterozygotes with rings of four or six chromosomes were highly fertile.
- Observation The authors suggest heterozygotes may enjoy a selective advantage in some localities.
- Observation The authors postulate local selection for a chromosome arrangement through a position effect.
- Observation Population chromosomal differentiation suggests complex Oenothera heterozygotes arose through hybridization of differentiated races.