4 Written questions
3 Multiple choice questions
- Ivy leaf and pine needle
- they provide positional information in the embryo
- "tinkering" with existing structures
3 True/False questions
The relative lengths of the frog and mouse branches in the phylogeny in Figure 26.13 in your textbook indicate that
frogs evolved before mice.
the genes of frogs and mice have only coincidental homoplasies.
the homolog has evolved more slowly in mice.
the homolog has evolved more rapidly in mice.
mice evolved before frogs. → they provide positional information in the embryo
Earth probably formed _____ years ago, and the first life evolved as early as _____ years ago.
4.5 billion years ago ... 3.9 billion years ago
Humans observed neither event, so there is no way to tell.
6,000 years ago ... 6,000 years ago
3.9 million years ago ... 2.0 billion years ago
10 billion years ago ... 4.5 billion years ago → they provide positional information in the embryo
Miller and Urey's experiments that attempted to recreate conditions on early Earth were significant because _____.
they showed how polymers could form spontaneously on a clay substrate
they showed that organic molecules such as amino acids could be produced from inorganic molecules
they showed how radiometric dating could be used to give the absolute ages of rocks and fossils
proved the endosymbiotic theory
they produced the first protocells → they showed that organic molecules such as amino acids could be produced from inorganic molecules