Explain why the membrane potential of a resting neuron is typically around 260 to 280 mv

Nernst equation is 62mV x log (conc ions outside/conc ions inside) Ion movement through ion channels creates a membrane potential. K+ conc at equilibrium is -90mV but because of the positive charge of Na+ inside, the ways of Na+ is opposite K+ and creates a charge less negative inside the cell. The resting potential reflects the small movement of sodium ions across a few open sodium channels in the resting neuron. 

yes it is weird but true

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.