You are interested in a new type of autosomal dominant mutation that gives purple eyes in Drosophila. You have a true-breeding purple-eyed line carrying a mutation that you call pr-1. You have isolated a second purple-eyed mutation that you call pr-2, which you have established in a true-breeding line that also carries a recessive marker st, which gives stubby legs. You cross a fly from the pr-1 line to a fly from the st, pr-2 line producing F1 females which you then cross to males from a true breeding st line (normal eyes). From this cross, 1000 progeny flies can be categorized into four different phenotypic classes:

                      

What is the relative order of st, pr-1 and pr-2?

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#Question id: 2144

#Unit 2. Cellular Organization

The type of membrane transport that uses ion gradients as the energy source is:

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#Question id: 3023

#Unit 2. Cellular Organization

During which phase of the bacterial growth curve does a bacterial population become much more resistant to harmful conditions?

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#Question id: 32309

#Unit 2. Cellular Organization

Cancer cells that contain constitutively active Ras use enhanced -_______?______to obtain increased nutrients from the surrounding environment in order to support their rapid growth and division.

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#Question id: 7132

#Unit 5. Developmental Biology

What happens if you introduce the gene myoD into fibroblast cells growing in culture?

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#Question id: 2537

#Unit 2. Cellular Organization

Which of the following is the smallest structure that would most likely be visible with a standard (not super-resolution) research-grade light microscope?