15. Hox genes a. allow differentiating neurons to “home in” on their eventual sp

Question

15. Hox genes

a. allow differentiating neurons to “home in” on their eventual specialized phenotype by small random changes in gene expression.

b. enable the progressive regionalization of the developing neural tube.

c. are found on all chromosomes in all vertebrate animals.

d. are activated whenever there are perturbations of homeostasis.

16. The peptide hormone that induces motor neuron development via the cooperative binding of Patched and Smoothened is called

a. Wnt.

b. TGF.

c. brain morphogenetic protein.

d. Sonic hedgehog.

e. retinoic acid.

23. The pattern of regeneration of the frog visual system supports the _______ hypothesis proposed by Sperry.

a. brain plasticity

b. chemoaffinity

c. apoptosis

d. synapse elimination

Explanation / Answer

15- Option B

Enable the progressive reguonalization of the developing neural tube.

16- Option D sonic hedgehog

17- Option B Chemoaffinity

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