#Question id: 5650
#Unit 5. Developmental Biology
Thalidomide, now banned for use as a sedative during pregnancy, was used in the early 1960s by many women in their first trimester of pregnancy. Some of these women gave birth to children with limb and organ deformities, suggesting that the drug most likely influenced ________.
#Question id: 5649
#Unit 5. Developmental Biology
From earliest to latest, the overall sequence of early development proceeds in which of the following sequences?
#Question id: 5648
#Unit 5. Developmental Biology
Use the following information to answer the question. In order to test how sea urchin sperm bind to eggs, scientists isolated the egg receptor protein that binds to the sperm acrosomal protein called bindin. Plastic beads were coated with egg receptor for bindin (ERB1) from eggs of the sea urchin Strongylocentrotus purpuratus, and then the beads mixed with sperm from S. purpuratus or from the related species, S. franciscanus. The researchers counted how many sperm were bound to each bead. The results are shown in the graph below. Treatments:
A: S. purpuratus sperm mixed with S. purpuratus ERB1 beads
B: S. purpuratus sperm mixed with beads containing no ERB1 protein
C: S. franciscanus sperm mixed with S. purpuratus ERB1 beads
D: S. franciscanus sperm mixed with beads containing no ERB1 protein
What is a broader implication from the observations of the experiment?
#Question id: 5035
#Unit 5. Developmental Biology
A fertilized egg is called a:
#Question id: 5036
#Unit 5. Developmental Biology
The experiments of Spemann and Mangold first defined what feature of amphibian embryos?
#Question id: 5037
#Unit 5. Developmental Biology
Genes control development by: