A. Describe how embryological similarities across vertebrate species give some evidence of those species having descended from a common ancestor. B. Describe how biochemical analyses have helped provide support for a generalized theory of evolution. Provide references
Two recently discovered fish species, both found in waters off a small island. The two species are very similar in general structure, but there are two key differences between them. In species A, males are brightly patterned with blue, red, and purple scales, whereas the females are drab, and males are much larger than females. ...continues
Ecology Experiments Involving Habitat and Species Analysis
A. An ecologist studying desert plants performed the following experiment. She staked out two identical plots that included a few sagebrush plants and numerous small annual wildflowers. She found the same five wildflower species in similar numbers in both plots. The she enclosed one of the plots with a fence to keep out kangaroo ...continues
A. Doctors and nurse are constantly exposed to many infectious patients. Why are doctors and nurses not continuously ill? B. Why is the lymphatic system a “highway” for the spread of certain metastatic cancers? C. Erythrocyte-structure and function Erythrocytes (mature red blood cells) lose their mitochondria, nucleus, ri ...continues
Birds and mammals have a four-chambered heart, with two ventricles and two atria, but other modern reptiles have a three-chambered heart, with just one ventricle. Paleontologists debate whether dinosaurs had a typical “reptile-like” heart or a “birdlike” heart. Long-necked sauropod dinosaurs could have had unusual circulatory de ...continues
Darwin’s theory of evolution by natural selection
Explain Darwin’s theory of evolution by natural selection; be sure to include the importance of variation.
Postulate why populations in northern climates have gene pools in which most members have the recessive genotype (bb for blue) for eye color, while populations in Africa and South America more often have gene pools with the dominant genotype (B for brown).
Evolution, consequences, and prevention of antibiotic resistance
How has antibiotic resistance evolved? What are the consequences and what can be done?
Genetic Diversity Among Whooping Cranes
The whooping crane population was down to twenty-one individuals in 1944. Today there are more than 300. What can you speculate about their genetic diversity and what this means to their long-term survival?
Define species. How important is phenotype in identifying species? Give a specific example. What is the problem for paleontologists in establishing species?
