Mount Holyoke College

Biology 305
The Cellular and Molecular Basis of Development


Class Videos

Research and Research Videos

Bioethics Debate

Recommended Websites

Community Quiz

Contact Rachel Fink

Pictures in the Banner






This website will be used as a resources for sharing information during the semester. Each week in lab you will be performing your own experiments on a wide range of embryos, tissues, and cell types. Results from these manipulations will be posted here, "publishing" the images and videos we make in lab, so that everyone can review them at their leisure, and show them off to their envious friends.

These are the two species of sponges worked with in lab: the Red Beard Sponge, Microciona and the Yellow Bread Crumb Sponge, Halichondria. These beautiful images are from the Marine Resources Department at the Marine Biological Laboratory, Woods Hole, which supplies us with much of our living material.

Images from Bio 305, Fall 2006

Amelia Harris wins Honorable Mention in

Olympus Bioscapes 2006 Digital Imaging Competition!

Sponge reaggregation:

These three panels show different reaggregates of Microciona sponge cells in normal MBL seawater. Photos by Alicia Hunsaker.

Sea urchin development: We were able to attend a conference on sea urchin
development at the Marine Biological Laboratory, Woods Hole, on Sept 29-30,
2006, thanks to a generous grant from Scion Natural Sciences Association.

Back in lab, we looked at embryos of Lytechinus variegatus:

This early blastula was photographed by Alex Pradas and Heather Johnstone.

These are pluteus larvae seen under polarized light, so that only the birefringent skeletons are visible.

This larva is seen under partially polarized light, and both the tissues of the embryo and the birefringent skeleton are visible. Note that only one half
of the skeleton is "glowing".