This is the part of MendelWeb known as The Reader's Mendel.

the informal name for 'evolutionary developmental biology', a branch of evolutionary studies that seeks to contribute insights from , and to help scientists better understand how new arise from existing life forms

Darwin defined this term as "descent with modification." It is the change in a lineage of populations between generations.

2. identify the dominant and recessive phenotypes in a pedigree showing that pattern.

Metamorphosis in both insects and amphibians is controlled by hormones, and often involves considerable destruction of larval tissues by .

All animals that are multicellular and whose are organized into tissues and organs.

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I am always happy to receive your comments, suggestions, and corrections.

Donkeys and horses are postzygotically isolated from one another; a male donkey and a female horse can mate to produce a mule, but the mule is sterile.

A form of in which the two species never reach the stage of successful mating, and thus no is formed.

The basic structural and functional unit of most living organisms.

In 1991, Kimbel and Yoel Rak found a 70 percent complete skeleton of .

The second highest level of taxonomic classification of organisms (below domains).

Cell size varies, but most cells are microscopic.

The implication for humans is still being researched, but evidence indicates that mild fevers can have a number of important immunological functions that allow us to better fight bacterial and viral infections.


Any recognizable trait, feature, or property of an organism.

Among her research interests is a study of Nicaraguan Sign Language.

An anatomist, Kimbel worked with Don Johanson and assembled Lucy's skull fragments.

A member of the Chordata, which includes the , lancelets, and .

Knowlton is professor of marine biology at the Scripps Institution of Oceanography, University of California San Diego, and staff scientist at the Smithsonian Tropical Research Institute in Panama.

A paleontologist at Cambridge University in the U.K., Dr.

He has done research on the biochemical analysis of rattlesnake venom using immunological techniques, snake ecology, and lizard ecology.

Professor of biopsychology at New Mexico State University in Las Cruces.

A set of descended from a species.

He is the author of several popular books on human origins.

Johnson's research interests focus on the interactions and evolutionary relationships of amphibian and reptilian species of tropical American and Mexican desert ecosystems.