Is "evolution" a proven fact or a theory? What other ideas compete with evolution to explain changes in populations? What are the differences between these competing ideas?
Today scientists try to classify cretures on the basis of evolutionary relationships. True or false? Because taxonomy, all scientists always agree on the species of all animals. True or false? If spiders and scorpions belong to the same class, then they must also belong to the same phylum. True or false? Scientist only ...continues
Which of the following statements do scientists beleive to be true- (A) Life on earth began about 5000 years ago. (B) The largest mass extinction occurred at the end of the twentieth century. (C) 245 million years ago there was only one landmass. (D) Microorganisims are generated by a life force in the air. Which of the f ...continues
Australia, bird with three-toed feet
A. At one time the continent of Australia was connected to Asia. About 50 million years ago Australia became separated. It has many unusal animal not found elsewhere, such as the kangaroo and the koala bear. Using the concepts of geographic isolation the gene pool, explain why these animal developed. B.A species of bird with ...continues
1. Who were a three scientist whose work was fundamental to Darwin's theory? How did their thinking influence his? 2.Vestigial Organs and Embryology are types of evidence that support the theory of natural selection. How each support the theory of natural selection?
What kind of specimen (choose one) Darwin collected during his five-year voyage aboard the Beagle? How this piece of evidence contributed to Darwin's understnding of the mechanism of evolution?
Early in the last century, English physician Archibald Garrod noticed that about half the albinos he saw in the course of his practice were the children of first cousins who had married each other. In almost all of the cases of albinism that he saw, whether or not the parents were related to each other, both of the parents were ...continues
You have found a sex-limited gene that codes for male color in a Lake Victoria cichlid fish species. The dominant (R) allele codes for a red color and the recessive (r) allele codes for a greenish color. a) As you examine different populations of this species, you find that the R allele predominates in some populations and r ...continues
The blood disease beta-thalassemia results from homozygosity for a defective allele in the gene coding for the beta hemoglobin subunit. Homozygotes for the beta-thalassemia allel die in childhood, while heterozygotes appear normal. This disease is common in the region around the Mediterranean sea, including the island of Sardini ...continues
You are investigating the Bmp4 gene, which is involved in beak development, in the Darwin's finch Geospiza fortis. You find a DNA polymorphism, a single-base difference between two alleles at this locus. a) Does this polymorphism necessarily have an effect on the phenotypes of the birds of this species? Justify your answer. ...continues
