What is the sequence of events in the gastrulation process in Biomphalaria? A gastrulation occurs by invagination or endoboly, 26 hours after the ...
What is the sequence of events in the gastrulation process in Biomphalaria?
A gastrulation occurs by invagination or endoboly, 26 hours after the first cleavage.
Initially, there is a penetration of the macromeres 5A-5C, followed by the endomeres 5a-5c and the descendants of 4a-4c.
The blastopore is located on the opposite side of the cross figure, in the original vegetative pole.
The prototroch is formed by a double row of cells, a superior one formed by the terminal cells of the ventral arm of the cross 2b111 and 2b112, and an inferior one formed by the descendants of cells 2b2112 and 2b1212 and cells 2b2111 and 2b1211.
a) I and II are correct.
b) II and III are correct.
c) III and IV are correct.
d) I and IV are correct.
A gastrulation occurs by invagination or endoboly, 26 hours after the first cleavage.
Initially, there is a penetration of the macromeres 5A-5C, followed by the endomeres 5a-5c and the descendants of 4a-4c.
The blastopore is located on the opposite side of the cross figure, in the original vegetative pole.
The prototroch is formed by a double row of cells, a superior one formed by the terminal cells of the ventral arm of the cross 2b111 and 2b112, and an inferior one formed by the descendants of cells 2b2112 and 2b1212 and cells 2b2111 and 2b1211.
a) I and II are correct.
b) II and III are correct.
c) III and IV are correct.
d) I and IV are correct.
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Ed 
The correct alternative is (d) I and IV are correct.
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