While the embryo is developing, extra-embryonic membranes form around the embryo. One of these membranes is...
While the embryo is developing, extra-embryonic membranes form around the embryo. One of these membranes is the yolk sac. From the list below, select the three things that form from the yolk sac.
parts of the digestive tract
future sperm or egg cells
portions of the urinary bladder
the placenta
the umbilical cord
first blood cells
Homework Answers
Ans ) The correct 3 things that form from the yolk sac during embyogenesis from option is following -
b) future sperm or egg cell
e) the umbilical cord
f) first blood cell
Explanation -
Yolk sac in play a various role in embryonic development . Some are -
1) Yolk cell develop in to primordial germ cell and this primordial cell infuture develop in to germ cell like sperm or ovum . Hence yolk sac involve in formation of future sperm or egg cell.
2) The remanants of yolk sac develop in to umbilical cord.
3) first of all hemopoiesis occur in yolk cell in embryo called blood island which develop first blood cell .
conclusion - from the above discussion it is clear that these 3 things formed by yolk sac . Hence it is correct answer.
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- The two germ layers that form the chorion in mammals
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