Primary sex ratio. Butterfly Protenor. Views Read Edit Protenor sex determination in Bootle history. Enter One Time Password. The various genetically controlled sex-determination mechanisms have been classified into following categories : Chromosomal theory of sex determination The X-chromosome was first observed by German biologist, Henking in during the spermatogenesis in male bug and was described as X-body.
The XO flies are male, but sterile. Wilson and Stevens
Get the app to study this deck anytime, anywhere. Turner syndrome. MSY has 3 regions:. AXX and other with single autosomal genome but no sex chromosome A. Males only have one chromosome X and are represented by XO - they act as the heterogametic sex.
Chromosome Research. The zero sometimes, the letter O signifies the lack of a second X. In human females, having only a single X chromosome is known as Turner syndrome. Jump to: navigationsearch.
Males only have one chromosome X and are represented by XO - they act as the heterogametic sex. Different types of chromosomal mechanisms of sex-determination in animals. On mating to diploid males their progeny consisted of following types :.
Hymenopterous insects, such as bees, wasps, saw flies, and ants, show a unique phenomenon in which an unfertilized egg develops into a male and a fertilized egg develops into a female. Unlike Drosophila X : A does not influence sex determination. Y chromosome.