Crabs Have Claws on Their Front Legs and Many Sets

question 35

Essay

Crabs have claws on their front legs and many sets of walking legs (which lack claws)on segments posterior to the claws.Crabs can regenerate legs if they are lost.A walking leg was removed and tissue from the claw was transplanted onto the stump.If homeobox genes are responsible for the differentiation of leg types,what would you predict would happen to the stump? What might be an analogous experiment from the chapter?

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Definitions:

Adaptation

Piaget’s term for adjustment to new information about the environment, achieved through processes of assimilation and accommodation.

Circular Reactions

Piaget’s term for processes by which an infant learns to reproduce desired occurrences originally discovered by chance.

Reflexes

Involuntary and immediate responses to specific stimuli, such as pulling a hand away from a hot surface, that are crucial for survival.

Habituation

The process by which there is a decrease in response to a stimulus after being repeatedly exposed to it, leading to an adaptation or normalization of response.