7 Questions
What do cranial placodes give rise to in vertebrates?
Sensory ganglia
How many copies of Hox genes do living gnathostomes (including humans) have?
4
What are transitional forms in terms of evolution?
Organisms that show traits from both an ancestral and a descendant group
What is Haikuoella considered to be among chordates?
The earliest craniatelike chordate
What features did Haikuoella possess?
Anterior brain and eyes
How many additional copies of genes controlling the body plan do living gnathostomes have compared to lancelets?
4
In what time frame were Hox genes thought to have duplicated?
Around the time of the origin of vertebrates
Test your knowledge on Echinodermata classes including Crinoidea, Asteroidea, and Ophiuroidea. Learn about the characteristics, behaviors, and species within each class.
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