The mesoderm of the anterior part of a vertebrate embryo is programmed to produce forelegs rather than hind legs by

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Quizplus · Accepted Answer

Hox genes are responsible for specifying the identity of different body regions along the anterior-posterior axis, including the development of limbs. In vertebrates, Hox genes are expressed in different patterns along this axis, leading to the formation of different limb types. The expression of specific Hox genes in the mesoderm of the anterior part of the embryo results in the development of forelimbs rather than hind legs.

The Mesoderm of the Anterior Part of a Vertebrate Embryo