#Question id: 7113
#Unit 5. Developmental Biology
In flies, frogs, and chicks, gradients of morphogens determine the future antero-posterior and dorso-ventral axes of the developing embryo. How is the antero-posterior axis determined in C. elegans?
#Question id: 7114
#Unit 5. Developmental Biology
What are the lin-4 and lin-14 genes of C. elegans?
#Question id: 7115
#Unit 5. Developmental Biology
The ability of the sea urchin embryo to regulate its development illustrates the fact that there are maternally-determined differences along the animal-vegetal axis that are necessary for normal development. Which of the following statements about regulation in sea urchin embryos is consistent with that fact?
#Question id: 7116
#Unit 5. Developmental Biology
Which one statement best describes gastrulation in sea
urchins?
a) Gastrulation is initiated by invagination of the
micromeres at the vegetal pole.
b) The mouth of the pluteus larva will form from
mesomeres on the oral side of the 60-cell embryo.
c) The gut will form from the macromeres at the
16-cell stage.
d) Mesenchymal cells originating at the vegetal pole
will invaginate first during gastrulation and will form skeletal structures in
the pluteus larva.
Which of the following combination is correct?
#Question id: 7117
#Unit 5. Developmental Biology
Which of the following statements explains why gain-of-function mutation of Pmar1 results in a vegetalized embryo:
#Question id: 7118
#Unit 5. Developmental Biology
At the molecular and cellular level, how does morphogenesis differ from establishment of embryonic axes and the specification of cellular identity?