Dihybrid Crosses

Mendel crossed varieties of peas that differed in two characteristics—that is, he performed dihybrid crosses.

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#Unit 7. System Physiology – Animal

The resting membrane potential of the hair cells is about

–60 mV. 

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Vibration of the organ of Corti causes bending of stereocilia on the hair cells by a shearing force as the cilia push against the tectorial membrane

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#Unit 7. System Physiology – Animal

When the shorter stereocilia are pushed toward the taller ones, the open time of cation channels is increased

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#Unit 7. System Physiology – Animal

K+ & Ca2+ enter via the channel and produce depolarization

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When the stereocilia are pushed toward the kinocilium, the membrane potential is decreased to about –50 mV.

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#Unit 7. System Physiology – Animal

The K+ that enters hair cells via the mechanically-sensitive cation channels is recycled. In the cochlea, K+ eventually reaches the stria vascularis and is secreted back into the endolymph, completing the cycle