Long, threadlike structures made of protein and nucleic acid containing hereditary materials are known as :

Sex cells (sperm and ova) are called:

During menstrual flow, what body structure secretes hormones into the bloodstream to "direct" another ovarian follicle to begin rapid growth?

A medical diagnostic procedure, used by physicians to identify hereditary defects before an infant's birth that draws fluid from the sac surrounding the fetus, is called:

 

What is puberty?

The newly fertilized ovum is called a :

The primary female reproductive organs, the ovaries, produce mature ova and the female sex hormones:

The placenta is the organ that:

During ejaculation, as the sperm pass out of the man's body through the penis, secretions that fuel and protect the sperm are also released from the:

The principle that describes development as starting with the head and brain areas and moving downward is called: