In C. elegans, cell-cell signaling specifies vulval cell fates, causing the Pn.p, cells to adopt primary, secondary or tertiary fates. Give the predicted effect of the following mutations in each of the cell fates listed (i.e. increase, decrease or no change for each cell type): primary tertiary rationale A. ras (gf) | B. loss of one of the kinases C. ras (gf) plus loss of kinase

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15-12-2022
Biology

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In C. elegans, cell-cell signaling specifies vulval cell fates, causing the Pn.p, cells to adopt primary, secondary or tertiary fates. Give the predicted effect of the following mutations in each of the cell fates listed (i.e. increase, decrease or no change for each cell type): primary tertiary rationale A. ras (gf) | B. loss of one of the kinases C. ras (gf) plus loss of kinase

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AnnuG AnnuG · Answer 1 · 2022-12-25T09:24:54-05:00

In C. elegans, cell-cell signalling specifies vulval cell fates, causing the Pnp, cells to adopt primary, secondary or tertiary fates. The primary will increase with rate of ras function, decrease with loss of one kinase and no change in ras (gf) plus loss of kinase. The tertiary will have no effect during loss of one kinase but increase with gain of ras function.

(A) The predicted effect of the ras (gf) mutation is that, mutation in each of the cell will have the fate as follows. The gain of ras function will increase in primary and tertiary. More than three of the six VPCs differentiate into vulva cells.

(B) The predicted effect of the loss of one kinase mutation is that, mutation in each of the cell will have the fate as follows. The loss of kinase will have no effect on tertiary and primary will decrease. One of the two daughter cells of P6.p (primary cell) fails to divide further and differentiate into vulval tissue whereas the two adjacent VPCs are normal, resulting in two small ventral protrusions. The defective P6.p daughter cell can be at either the left or right side of the normal daughter cell.

(C) The predicted effect of the ras function plus loss of one kinase mutation is that, mutation in each of the cell will have the fate as follows. The ras function plus loss of one kinase will have no effect on both primary and tertiary. The vulva development is same as in wild type.

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