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Answer to Question #43525 in Other Biology for Mel

Question #43525
In the cross MMnn X mmNN, what proportion of the resulting F1 would be homozygous dominant for both genes?

Firstly, what does this question even mean? And I tried working this out using the punnet square but failed miserably, please help.
Expert's answer
Parents MMnn and mmNN can producetwo types of gametes: Mn and mN. Therefore, their offspring are heterozygous: MmNn. That means that all hybrids have two different alleles of the gene: dominant M and recessive m; dominant N and recessive n. None of the resulting hybrids (0%) will be homozygous, either recessive mmnn, or dominant MMNN. 

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