Sensory neuron
A nerve cell that receives information from the internal and external environments and
transmits the signals to the central nervous system.
Sensory receptor
A specialized structure that responds to specific stimuli from an animal's external or internal
environment; transmits the information of an environmental stimulus to the animal's
nervous system by converting stimulus energy to the electrochemical energy of action
potentials.
Sepal
A whorl of modified leaves in angiosperms that encloses and protects the flower bud before
it opens.
Septate
Divided by a septum or septa
Septum
A partition, or cross wall, that divides a structure, such as a fungal hypha, into
compartments.
Sessile
Attached; not free to move about.
Sex chromosomes
The pair of chromosomes responsible for determining the sex of an individual.
Sex-linked genes
Genes located on one sex chromosome but not the other.
Sex-linked trait
An inherited trait, such as color discrimination, determined by a gene located on a sex
chromosome and that therefore shows a different pattern of inheritance in males and
females.
Sexual dimorphism
A special case of polymorphism based on the distinction between the secondary sex
characteristics of males and females.
Sexual reproduction
A type of reproduction in which two parents give rise to offspring that have unique
combinations of genes inherited from the gametes of the two parents.
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