Question

in whiptail lizards only females are born generation after generation there is no males ? how is it possible

Answer 1

Because of hybridization this happens

Answer 2

I think they reproduce by parthenogenesis according to researches and discoveries made. Parthenogenesis is reproduction of ovum without fertilization or without sperm. Parthe- mean virgin and genesis - means birth. The female lizard mate with other female lizards and with the help of parthenogenesis they reproduce. They use twice the set of chromosomes i.e. two sets of chromosomes from a single female lizard recombine and produce genetically diverse offsprings. Usually two sets of chromosomes one set from male and other set from female recombine but in these lizards a single lizard releases two different sets.

Hope this helps you.