Entries by Daphne Hanson

The fossils Dubois and Dart.

The fossils Dubois and Dart. -What were some reasons people were resistant to the idea that the fossils Dubois and Dart found were human ancestors? What makes it so hard to classify all these fossils (by Dubois, Dart, and others)?

Characteristics of phylum Echinodermata.

Morphological characteristics of phylum Echinodermata. Identify the morphological characteristics shared by all groups in the phylum Echinodermata. Define the distinguishing characteristics of chordates and vertebrates, and contrast them with the characteristics of other animal phyla. Explain how the duplication of Hox genes and Hox gene complexes relates to the evolution of novel characteristics and new body plans in vertebrates.

Mendel trait experiments.

Mendel trait experiments. When Mendel performed his experiments, only one trait appeared in the F1 generation, (in this case, round peas) and the other trait (wrinkled peas) had seemingly disappeared. However, once he let the plants of the F1 generation self-fertilize, the wrinkled peas reappeared!  If you were Mendel, how would you explain this phenomenon?