1. The discovery in the 1990s that mammals and insects have many of the same developmental genes led to the conclusion that a. mammals and insects are more closely related than was... 1. The discovery in the 1990s that mammals and insects have many of the same developmental genes led to the conclusion that a. mammals and insects are more closely related than was previously thought. b. developmental genes are less susceptible to mutation than other genes. c. developmental genes alone do not determine the body forms of organisms. d. embryonic mammals and larval insects have similar body forms. 2. Allopolyploidy can quickly create new species due to a. spontaneous mutation within a species b. spontaneous mutation between two species c. spontaneous chromosome duplication within a species d. spontaneous chromosome duplication between two species 3. Darwin based his theory of evolution by natural selection on his observations of the a. genotypes of individuals. b. phenotypes of individuals. C. genotypes of populations. d. phenotypes of populations 4. When a species colonizes an island, the resulting population usually has less genetic variation than that of the mainland population. The most likely reason for this difference is a. mutation. b. gene flow. c. genetic drift. d. nonrandom mating. e. natural selection. b. If the barrier is removed from two populations that were formed by allopatric speciation, what characteristic would allow one to determine if the two populations had become separate species? a. Different morphologies b. Habitat specialization c. Inability to interbreed d. Competition for resources Read more

Understand the Problem

The questions are asking about various concepts in biology related to genetics, evolution, and speciation. Each question provides multiple-choice options regarding developmental genes, allopolyploidy, natural selection, genetic variation, and characteristics of species. The goal is to identify the correct answers based on biological principles.

More Information

The discovery of many shared developmental genes between mammals and insects has reinforced the idea of a common evolutionary origin, while also showing that genes are not solely responsible for body forms. Allopolyploidy involves chromosome duplication between species, facilitating rapid speciation. Darwin focused on phenotypic observations, and genetic drift often reduces the genetic variation in colonized populations.

Tips

A common mistake in genetics is confusing gene expression with the outcome of certain traits. Ensure clear distinction between genetic predisposition and phenotypic manifestation.

Sources

• Hox genes, evo-devo, and the case of the ftz gene - PMC - NCBI - ncbi.nlm.nih.gov
• Conservation of gene function in behaviour - PMC - NCBI - ncbi.nlm.nih.gov
• Homeotic Genes - an overview | ScienceDirect Topics - sciencedirect.com