A  plant species arrives at  an  island  for the first time, where it  is  exposed to  a  new set of  pollinators.  Over the course of 20 generations, the characteristics of its flowers change. The figures above show the frequency distribution of petal length in the original colonizing population (Figure 1) and 20 generations later (Figure 2). Which of these explanations is consistent with the observed change in petal length?

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#Question id: 2638

#Unit 2. Cellular Organization

Which of these systems give the best mode for turning trp operon off?

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#Question id: 19788

#Unit 13. Methods in Biology

Thermal modulation are used in PCR for the function of__

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#Question id: 12449

#Unit 10. Ecological Principles

What type of effect has an increasing impact as the population size increases?

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#Question id: 5960

#General Aptitude

The calendar of the year 2006 can be used again in which year?

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#Question id: 10997

#Unit 7. System Physiology – Animal

A 60-year-old woman has a resting heart rate of 70 beats/min, arterial pressure is 130/85 mm Hg, and body temperature is normal. Her pressure-volume diagram of the left ventricle is shown above.

What is her cardiac output in milliliters per minute?