AP Notes, Outlines, Study Guides, Vocabulary, Practice Exams and more!


evolution, cesarean sections

No votes yet

ANNALS OF HUMAN BIOLOGY, 1978, VOL. 5, NO. 5, 487--489 Natural selection and birthweight N. BLURTON JONES Department of Growth and Development, Institute of Child Health, University of London [Received 23 March 1978; revised 6 May 1978] Summary. Mean birthweight, even before induced births became commonplace, is slightly lower than the birthweight at which peri- natal mortality is lowest. This finding, once hard to explain by natural selection, is shown to be exactly in line with predictions from natural selection theory. 1. Introduction Karn and Penrose (1952) showed that mean birthweight in man was slightly lower than the "optimum" birthweight, defined as the weight at which perinatal
Subscribe to RSS - sections

Need Help?

We hope your visit has been a productive one. If you're having any problems, or would like to give some feedback, we'd love to hear from you.

For general help, questions, and suggestions, try our dedicated support forums.

If you need to contact the Course-Notes.Org web experience team, please use our contact form.

Need Notes?

While we strive to provide the most comprehensive notes for as many high school textbooks as possible, there are certainly going to be some that we miss. Drop us a note and let us know which textbooks you need. Be sure to include which edition of the textbook you are using! If we see enough demand, we'll do whatever we can to get those notes up on the site for you!