The treeʹs horizontal axis is a timeline that extends from 100,000 years ago to the present; the vertical axis represents nothing in particular. The labeled branch points on the tree (V—Z) represent various common ancestors. Letʹs say that only since 50,000 years ago has there been enough variation between the lineages depicted here to separate them into distinct species, and only the tips of the lineages on this tree represent distinct species.

According to this tree, what percent of the species seem to be extant (i.e., not extinct)?

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#Question id: 31255

#Unit 5. Developmental Biology

When the hypostome is brought into contact with the trunk of an adult hydra, it induces expression of the__________ in a Wnt-dependent manner.

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#Question id: 31256

#Unit 5. Developmental Biology

If the Wnt signaling inhibitor GSK3 is itself inhibited throughout the body axis in hydra, results

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#Question id: 31257

#Unit 5. Developmental Biology

Which of the following gene is expressed by all neoblasts and has become the most common marker for their identification across planarian species?

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#Question id: 31258

#Unit 5. Developmental Biology

In salamanders, regeneration blastema formed from:

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#Question id: 31259

#Unit 5. Developmental Biology

During salamander limb regeneration, which of the following functionally equivalent to apical ectodermal ridge during normal limb development?

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#Question id: 31283

#Unit 5. Developmental Biology

Egg activation in Drosophila is accomplished: