The hypothesis that there is a genetic component to some attitudes would be supported by the finding that

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The hypothesis that there is a genetic component to some attitudes would be supported by the finding that identical twins are more similar than those of fraternal twins.

This topic has been the cause of a permanent debate in the scientific and medical world. Some researchers affirm that attitudes are part of the human genes, while others say that attitudes are psychological results of what children start to live in their early years. There is controversy in both affirmations because some researchers have found that it is not conclusive the fact that the character and attitude of the parents can be inherited by their children.

you know they are heterozygous for a trait because they have it as jj or jj.