Views Read View source View history. Individuals that have a Y chromosome will appear to have the male phenotype, independent of the number of X chromosomes in their genotype . Additional X chromosomes lead to Barr bodies being present. The number of Barr bodies is determined by number of X chromosomes n — 1.
Namespaces Page Discussion.
Remarkably, a unisexual population of the seed bug Nysius groenlandicus has been found in Northern Greenland. Oviposition Female lygaeids generally lay eggs in clutches, which can range in size from 10 to over eggs Feir ; McLain and may lay many clutches in their lifetime.
This page was last modified on 22 Octoberat This creates the potential for intense sperm competition e. Insect has 14 chromosomes 2. For example, in birds, it is the female sex that is heterogametic and the male that is homogametic. Journal List Ecol Evol v.
Additional X chromosomes lead to Barr bodies being present. The presence or absence of the X chromosome in male gametes determines sex. Examples of organisms using this form of sex determination include: most mammals, including humans, as well as some insects.
Also, the addition of an extra Y chromosome in males would cause a genetic disorder called, " Super Male Syndrome ". In reptiles, incubation temperature during the critical period of embryonic development can affect the sex of the offspring.
Males being the heterogametic sex does not occur in every mammal. Personal tools Log in. Individuals that have a Y chromosome will appear to have the male phenotype, independent of the number of X chromosomes in their genotype .