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(A) In a Mendelian dihybrid cross,the two genes being studied are located on different pairs of homologous chromosomes,allowing for independent assort

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$2$ pairs and $1$ pair

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(A) In a Mendelian dihybrid cross,the two genes being studied are located on different pairs of homologous chromosomes,allowing for independent assortment. Therefore,it involves $2$ pairs of chromosomes.In a dihybrid cross involving linkage,the two genes are located on the same pair of homologous chromosomes,meaning they are linked and do not assort independently. Therefore,it involves $1$ pair of chromosomes.Thus,the correct sequence is $2$ pairs and $1$ pair.

How many pairs of chromosomes are involved in Mendelian dihybrid crosses and dihybrid crosses with linkage,respectively?

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