Question

You perform an in situ hybridization on Drosophila melanogaster embryos. You apply a probe labeled with a fluorescent stain that is complementary to mRNA transcripts of the gene hunchback. In early stages of embryogenesis you observe fluorescence for the entire anterior half of the embryo only. In embryos at a later stage of development you see the same pattern in the anterior, and also a stripe of fluorescence in the posterior half. What can you conclude about the expression of hunchback from this? Group of answer choices Hunchback moves from the anterior of the embryo to the posterior during development. Hunchback expression is more important in the anterior than in the posterior. Hunchback is never expressed in the posterior half of the embryo. Hunchback is first expressed in the anterior of the embryo and later in a portion of the posterior. Hunchback has been "knocked out" in some portions of the embryo.

Answer 1

The morphological features that embryos of various animals share between each other the greater the likelihood they are derived from a common ancestor

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