The heart consists of two kinds of muscle cells:

Contractile cells

Conducting cells

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#Id: 939

#Unit 5. Developmental Biology

In drosophila, the stem cells for sperm reside in a regulatory microenvironment called the hub.

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#Id: 940

#Unit 5. Developmental Biology

The mode of fertilization in sea urchin being external, the egg and spermatozoa are released into the sea water.

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#Id: 4733

#Unit 5. Developmental Biology

A stem cell retains the ability to divide and re-create itself while also having the ability to generate progeny capable of specializing into a more differentiated cell type.

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#Id: 6846

#Unit 5. Developmental Biology

Induction

Kind of interaction in which one group of cells changing the behavior of an adjacent set of cells, thereby causing them to change their shape, mitotic rate, or cell fate. 

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#Id: 6847

#Unit 5. Developmental Biology

There are two components of inductive interaction:

Inducer

Responder

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#Id: 6848

#Unit 5. Developmental Biology

Inducer 

the tissue that produces a signal (or signals) that changes the cellular behavior of the other tissue.