In the figure below,the grey boxes represent the offspring of parents that are heterozygous at locus 1 (Aa) and locus 2 (Bb) .Which of the grey boxes represent repulsion double heterozygote offspring? 
Definitions:
Scientific Theory
A well-substantiated explanation of some aspect of the natural world, based on a body of evidence and repeatedly tested hypotheses.
Testable Explanation
A hypothesis that can be supported or refuted through experimentation or observation.
Hypothesis
A proposed explanation for a phenomenon, subject to further testing and experimentation.
Photosynthesis
The process by which green plants, algae, and some bacteria convert light energy and carbon dioxide into chemical energy in the form of glucose, releasing oxygen as a byproduct.
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