In PCR, the primer length influences the rate at which primer molecules pair with template DNA; this rate decreases as the primer length increases.

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#Unit 5. Developmental Biology

Cells of the responding tissue must have both, 

A receptor protein for the inducing factor 

The ability to respond to the signal

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#Unit 5. Developmental Biology

Competence 

The ability to respond to a specific inductive signal

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#Id: 120

#Unit 5. Developmental Biology

Reciprocal induction occurs when the two interacting tissues are both inducers and are competent to respond to each other’s signals.

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#Unit 5. Developmental Biology

The development of the vertebrate eye is a classic example used to describe the modus operandi of tissue organization via intercellular interactions.

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#Id: 122

#Unit 5. Developmental Biology

In the initiation of the vertebrate eyes, paired regions of the brain bulges (optic vesicles, act as inducer) out and approach the surface ectoderm (act as responder) of the head.

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#Id: 123

#Unit 5. Developmental Biology

The head ectoderm is competent to respond to the paracrine factors made by the optic vesicles & induced to form the lens of the eye.