Consider the limb bud below, in which a chicken embryo has a gene mutation that ...

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Consider the limb bud below, in which a chicken embryo has a gene mutation that blocks proper formation of the structure marked by X.

What is the first and most obvious defect that

would occur in the limb bud if tissue X failed to form?

Failed anterior-posterior patterning

0%

Disrupted proximal-distal patterning

100%

Two ventral surfaces

0%

Over-proliferation of the progress zone

0%

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