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Questions and Answers
What do cranial placodes give rise to in vertebrates?
What do cranial placodes give rise to in vertebrates?
- Digestive organs
- Respiratory system
- Sensory ganglia (correct)
- Dorsal fin
How many copies of Hox genes do living gnathostomes (including humans) have?
How many copies of Hox genes do living gnathostomes (including humans) have?
- 4 (correct)
- 3
- 2
- 1
What are transitional forms in terms of evolution?
What are transitional forms in terms of evolution?
- Organisms that show traits from both an ancestral and a descendant group (correct)
- Fossils showing traits only from one group
- Species that never evolved
- Extinct species
What is Haikuoella considered to be among chordates?
What is Haikuoella considered to be among chordates?
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What features did Haikuoella possess?
What features did Haikuoella possess?
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How many additional copies of genes controlling the body plan do living gnathostomes have compared to lancelets?
How many additional copies of genes controlling the body plan do living gnathostomes have compared to lancelets?
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In what time frame were Hox genes thought to have duplicated?
In what time frame were Hox genes thought to have duplicated?
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