List I | List II | ||
A. | Mesozoic Era | I. | Lower invertebrates |
B. | Proterozoic Era | II. | Fish & Amphibia |
C. | Cenozoic Era | III. | Birds & Reptiles |
D. | Paleozoic Era | IV. | Mammals |
Genotypes | AA | Aa | aa |
Frequency | 22% | 62% | 16% |
1. | Homo erectus | 2. | Neanderthal man |
3. | Homo habilis | 4. | Australopithecus |
1. | This theory was proposed by Alfred Wallace. |
2. | Variations are small directional changes. |
3. | Single-step large mutation is a cause of speciation. |
4. | Large differences due to mutations arise gradually in a population. |