Age at 5 4 years 4 years 6 death years Lizard Lizard Lizard Lizard D has A is C is B has the very dark- mated largest Comments healthy, colored with territory strong, and many of all and very lizards the clever quick lizards Lizard A Lizard B Lizard C Lizard D 19. According to the theory of natural selection, where did the variations in body size in the three species of lizards most likely come from? The lizards needed to change in order to survive, so beneficial new traits developed. The lizards wanted to become different in size, so beneficial new traits gradually appeared in the population. Random genetic changes and sexual recombination both created new variations. The island environment caused genetic changes in the lizards. 20. What could cause one species to change into three species over time? Groups of lizards encountered different island environments so the lizards needed to become new species with different traits in order to survive. Groups of lizards must have been geographically isolated from other groups and random genetic changes must have accumulated in these lizard populations over time. There may be minor variations, but all lizards are essentially alike and all are members of a single species. In order to survive, different groups of lizards needed to adapt to the different islands, and so all organisms in each group gradually evolved to become a new lizard species.
Age at death 4 years 5 years 4 years 6 Comments Lizard A is very healthy, strong, and clever Lizard B has mated with many lizards Lizard C is dark- colored and very quick Lizard D has the largest territory of all the lizards Lizard A Lizard B Lizard C Lizard D 19. According to the theory of natural selection, where did the variations in body size in the three species of lizards most likely come from? The lizards needed to change in order to survive, so beneficial new traits developed. The lizards wanted to become different in size, so beneficial new traits gradually appeared in the population. Random genetic changes and sexual recombination both created new variations. The island environment caused genetic changes in the lizards. 20. What could cause one species to change into three species over time? Groups of lizards encountered different island environments so the lizards needed to become new species with different traits in order to survive. Groups of lizards must have been geographically isolated from other groups and random genetic changes must have accumulated in these lizard populations over time. There may be minor variations, but all lizards are essentially alike and all are members of a single species. In order to survive, different groups of lizards needed to adapt to the different islands, and so all organisms in each group gradually evolved to become a new lizard species.
natural_selection_pretest.docx