A three point test cross was carried out in Drosophila melanogaster involving three adjacent genes A, B and C. arranged in the same order. The distance between A to B is 15 map unit (mu) and that between B to C is 30 map. The coefficient of coincidence = 0.67. What is the percentage of double recombinants in the progeny obtained from the testcross?

#Question id: 11252

#Unit 10. Ecological Principles

A populations of scale insects exhibited superior survival when transplanted within, rather than between, ponderosa pine trees. Variation in antiherbivore defenses among individual ponderosa pines thus appears to be paralleled by variation in genotypes of the scale insects that infest them. If this is the case, then the experiment demonstrates __________.

#Question id: 11253

#Unit 10. Ecological Principles

Experiments conducted by Francisco Ayala with fruit flies and by David Pimentel with houseflies and blowflies have demonstrated the rather interesting phenomenon that __________.

#Question id: 11254

#Unit 10. Ecological Principles

Character displacement:

#Question id: 11255

#Unit 10. Ecological Principles

Antiherbivore defenses in Umbelliferous plants and the insects feeding on these plants has shown that:

#Question id: 11256

#Unit 10. Ecological Principles

Inferences built on the idea that evolutionarily older and younger characters should be found among close relatives if they are linked by evolution has been elaborated into a branch of evolutionary biology known as __________.

#Question id: 11257

#Unit 10. Ecological Principles

Close examination of the yucca-yucca moth mutualism has shown that what appear to be coevolved traits may have been __________ that were critical to the establishment of the mutualism in the first place.