Barnacles are sessile (live attached hard marine crustaceans that live at the ed

Question

Barnacles are sessile (live attached hard marine crustaceans that live at the edge of the ocean, often where there are heavy waves. During sexual reproduction, the to a transfers a packet of sperm to the female using a more or less elongated penis. Barnacle males face a trade-off between reaching more mates and are conducting, their penises in turbulent water. In a study you are conducting. You find that on exposed shores with heavy wave action, barnacle penises are shorter, but on protected shores with smaller waves, their penises are longer (data shown in figure on the left). You devise an experiment to determine if this variation in barnacle penis length is due to heritable differences among populations or has a purely environmental basis. In this experiment you newly hatched larvae from parents at each site and grow them in the opposite habitat. Larvae from exposed shores are grown in protected shores and vice versa. You allow them to grow up and measure penis length. You data is shown in the figure below. The reaction norm, the line connecting the points in the figure above, allows us to do what? a. see a distinction between species. b. see if evolution in penis length has occurred. c. predict the value for penis length in different environments d. none of the above

Explanation / Answer

IN ABOVE EXPERIMENT FROM THE GRAPH IS WAS SEEN THAT THE EXPOSED SHORES SHOWED MAXIMUM RELATIVE LENGTH OF EXTERNAL GENITAL ORGAN THAN THE PROTECTED SHORE, SIMILARLY WAVE EXPOSED SHORES SHOWED SHOTER AND WIDER MALE GENITALS THAN THE WAVE PROTECTED SHORES. IN ABOVE EXPERIMENT WHETHER THE BARNACLES COMES FROM EXPOSED OR PROTECTED AREAS BOTH MALE GENITALS LENGTH AND SIZE CONVERGE AT A SPECIFIC POINT.

THE ANSWER FOR ABOVE QUESTION IS C. THE REASON IS THAT THE EXPERIMENT FOCUSES ON THE USE OF BARNACLE GENITALS AT DIFFERENT ENVIRONMENTAL CONDITION INCLUDING SHORES WHETHER EXPOSED OR PROTECTED.

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