The genes dumpy wings (dp), clot eyes (cl), and apterous wings (ap) are linked on chromosome ii of drosophila. in a series of two-point mapping crosses, the genetic distances shown below were determined. what is the sequence of the three genes?
a. dp-ap 42
b. dp-cl 3
c. ap-cl 39

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

Refer to this portion of a dichotomous key for fish identification to answer the question. 1. (a) has a single dorsal fin ® 5 (b) has a double dorsal fin ® 2 2. (a) one fin is spiny, the other is smooth ® 3 (b) one fin is not spiny or smooth ® 4 5. (a) has small fin on back near tail ® 6 (b) has no fin on back near tail ® 7 6. (a) has barbs near the mouth ® catfish (b) does not have barbs near the mouth ® 10 7. (a) tail is asymmetrical ® 8 (b) tail is symmetrical ® 9 10. (a) scales are small ® trout (b) scales are large ® whitefish what is the next step to complete to identify a fish that has a single dorsal fin, no fin on the back near the tail, and no barbs near the mouth? step 2 step 5 step 7 step 10

What term describes a doctor who becomes a specialist by meeting standards beyond those of getting a license and passing a test in the specialty area?