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Unformatted text preview: " ' Posterior Signal Receptor protein Anterior " Posterior daughter g Q "3' daughter cellof3 .-’ " cellof3 Will go on to Will go on to
form adult intestine form muscle
and gonads (a) Induction of the inteStinal precursor cell at the four-cell
stage. A signal protein. on the surf-ace of cell 4 induces events .
in_'ce|| 3 that determine the fate of the posterior daughter cell
of- cell 3. The fates of the cells arising from the anterior '
daUghter-cell are determined by later events. Epidermis\ LARVA Signal
Gonad Anchor cell protein Vulval precursorcells ADULT "1' inner vulva Outer-vulva Epidermis (b) Induction of vulvai cell types during larval development.
The vulva arises from six-precursor cells on the embryos ventral
surface. The anchor cell in the gonad secretes many copies of a
particular signal protein, providing a strong inductive signal to
the closest precursor cell (dark blue), causing it to form the inner
part of the vulva. The two adjacent cells (medium blue) receive a
weaker signal and are induced to form the outer vulva. The
three remaining precursor cells.(light blue) are too far away to
receive the signal; they give rise to epidermal cells. Additional
signaling among the precursor cells, not depicted in this figure,
also plays a role in vulvai development, ...
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This note was uploaded on 09/23/2010 for the course BIO 202 taught by Professor Dean during the Fall '08 term at SUNY Stony Brook.
- Fall '08