A Field Experiment Is Conducted to Test for a Heterozygote

question 22

Multiple Choice

A field experiment is conducted to test for a heterozygote advantage in the survival of a mustard plant.When heterozygotes for the A locus are first crossed,the yield is 200 AA,400 Aa,and 200 aa ( i.e. ,a ratio of 1:2:1) .In trial 1,35 AA,44 Aa,and 23 aa plants survive.In trial 2,25 AA,68 Aa,and 21 aa plants survive.In trial 3,27 AA,48 Aa,and 23 aa plants.Based on these results,which statement is true?

• A) Only trial 1 shows heterozygote advantage.
• B) Only trial 2 shows heterozygote advantage.
• C) Both trials 1 and 2 show heterozygote advantage.
• D) Only trial 3 shows heterozygote advantage.
• E) No trial shows heterozygote advantage.

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