Fill in the Blanks PregnancyOnline version Listen to the audio and fill in the gaps by Ruben Patricio Guanuche Diaz 1 uterine male zygote placenta fallopian uterus egg female Pregnancy embryo baby oxygen nutrients umbilical sperm begins in the , where a fertilizes an . If the sperm carries an X chromosome , the will become , while a Y chromosome will result in the baby becoming . fertilized egg , or , divides repeatedly as it travels through the tube , implanting itself on the wall to form both the and a specialized organ known as the placenta . The will manage waste and provide , , and hormones via the cord .