Examlex
In Drosophila, mutation screening usually involves use of a balancer chromosome that includes three elements: a set of overlapping inversions, an easily recognized dominant mutation, and a recessive lethal mutation that prevents balancer homozygotes from surviving. Which one, or combination, of these elements is necessary and sufficient to suppress crossovers?
Preoperational
A stage in Jean Piaget's theory of cognitive development during which children aged approximately 2 to 7 years old develop memory and imagination.
Formal Operational
A stage in Piaget's theory of cognitive development where individuals gain the ability to think abstractly, systematically, and logically.
Object Permanence
The understanding that objects continue to exist even when they cannot be seen, heard, or otherwise sensed, a concept typically developed during infancy.
Sensorimotor Substage
A phase in Piaget's theory of cognitive development, where infants learn through interacting with the world via their senses and actions.
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