Scientists using RNA in situ hybridization techniques observed that a transcription factor called macho-1 localized to some cells during early cleavage, but not others. Descendents of the cells expressing macho-1 produced mesoderm
If you prevented the expression of macho-1 in an embryo during cleavage, which structures would be most likely be absent in later development?
A) neural tube
B) somites
C) digestive system
D) skin
Answer: B
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Conservation biologists are often concerned that when the population size of an endangered species becomes too small it is at risk of extinction for which reason?
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