liu.seSearch for publications in DiVA
Change search
ReferencesLink to record
Permanent link

Direct link
The honesty of the female sexual ornament in Gallus gallus
Linköping University, Department of Physics, Chemistry and Biology, Zoology .
2010 (English)Independent thesis Advanced level (degree of Master (Two Years)), 40 credits / 60 HE creditsStudent thesis
Abstract [en]

Sexual selection was defined by Darwin in 1871 as selection acting solely on reproduction success. It is known to act on males resulting in extravagant ornamentations or other attributes, but in recent years more studies have shown that sexual selection also act on females. There is empirical evidence in several taxa that the secondary sexual ornament also acts as a measurement on the females’ reproductive quality, it is an honest trait. In Gallus gallus the comb has been found to be an honest ornament. Quantitative Trait Loci have been found on chromosome 1 and 3 for comb- and egg size. The honesty of the comb is hypothesized to be caused by either a pleiotropic effect gene linkage. In this study an 8th generation Advanced Interline Cross was used to guarantee maximum recombination of alleles to observe phenotypic effects. 177 females were detained during 4 weeks to measure fecundity. Egg number, mean egg weight and total egg size were correlated to comb size: length, area and weight. Correlation between comb size and total egg weight were found to be negative, suggesting the comb to be a dishonest signal. The phenotypic measurements observed in this study suggest that the genes for egg production and comb size are linked, and this linkage has been broken in the F8 analysed in this study.

Place, publisher, year, edition, pages
2010. , 17 p.
Keyword [en]
AIL, comb, egg, fecundity, female ornamentation, honest, QTL
National Category
Natural Sciences
URN: urn:nbn:se:liu:diva-57100ISRN: LiTH-IFM-Ex--10/2305--SEOAI: diva2:323214
, Linköpings universitet, Linköping (English)
Life Earth Science
Available from: 2010-06-10 Created: 2010-06-09 Last updated: 2011-05-18Bibliographically approved

Open Access in DiVA

fulltext(677 kB)156 downloads
File information
File name FULLTEXT01.pdfFile size 677 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 156 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 104 hits
ReferencesLink to record
Permanent link

Direct link