A pioneering Latino rocker of the '50s, Richie Valens had several big hits -- including La Bamba, Donna, and Come on, Let's Go -- before dying tragically in a plane crash with Buddy Holly. Read Full Biography.
This is one of the most common questions I receive from parents-to-be. Most patients undergo an ultrasound at around 18-20 weeks (about four and a half to five months). Normally, at this stage of pregnancy we can determine the baby's sex, but not always. The position of the baby during the ultrasound is the most important aspect in our ability to tell the baby's sex, andthere's no way to influence that. For obvious reasons, it's usually easier to see if the baby is a boy.
A) The male determines sex because the sperm can fertilize either a female egg or a male egg. B) The female gamete determines sex because only the female gamete provides cytoplasm to the zygote. C) The male gamete determines sex because each male gamete can contribute either an X or a Y chromosome. D) The chromosome contribution from both parents determines sex because the offspring uses all the parents' chromosomes.