Crossing over, Independent assortment and Random Fertilization all cause variation. When filling in the boxes of a Punnett Square which one are you actually doing?

Apart of an ecosystem that can restrict the growth of a population is referred to as

How does secondary succession differ from primary succession?

Anurse is caring for a 42-year-old client who is scheduled for an amniocentesis during the fifteenth week of gestation because of concerns regarding down syndrome. what other fetal problem does an examination of the amniotic fluid reveal at this time?