Sex-role reversal, in which males care for offspring, can occur when mate competition is stronger between females than males. Secondary sex traits and mate attracting displays in sex-role-reversed species are usually more pronounced in females than in males. The red phalarope (Phalaropus fulicarius) is a textbook example of a sex-role-reversed species. It is generally agreed that males are resp...

The effects of reproductive compensation on the population genetics of sex-linked recessive lethal mutations are investigated. Simple equations are presented which describe these effects, and so complement existing population genetic theory. More importantly, this type of mutation is responsible for several severe human genetic diseases such as Duchenne muscular dystrophy. It is argued that th...

The objective of this study was to develop a simplified, efficient, and accurate protocol for sexing goat embryos. Based on the amelogenin gene located on the conservation region of Xand Ychromosomes, a pair of primers was utilized and the system of PCR was established to amplify a 262 bp fragment from the Xchromosome in female goats, and a 262 bp fragment from Xchromosome and 202 bp fragment f...

Sex determination of straw-headed bulbul offspring was carried out from 27 offspring’s plucked feather samples in a captive breeding program. Using direct PCR, this study provided more evidences that are reliable as source DNA for non-invasive and effective molecular sexing. The also revealed the sex ratio slightly inclined towards males, but there no significant difference value 0.5.