The mitochondrial DNA study indicated that there was no genetic input from Neanderthals in modern humans, but the whole-genome study suggests that, in fact, there was. One suggestion to explain this discrepancy is that the Neanderthal input into modern human populations was from males only. Which of the strategies could be employed to test this hypothesis? Look at genomic DNA only in modern humans that are male. Look at the X chromosome because that is bi-parentally inherited. Look at the Y chromosome because it is paternally inherited. Look at genomic DNA only in modern humans that are females.

look at the Y chromosome is the strategy  

Explanation:

Finally, it is possible that front line individuals do pass on at any rate one mtDNA heredity that Neanderthals added to our genome, in any case, that we have not yet sequenced that family line in either modern individuals or in Neanderthals. Any of these explanations could underlie the nonappearance of Neanderthal mtDNA in modern human population.Because the y chromosome inherited by paternally and mitrochondrial DNA identify the case of maternity, or parents where it helps to the person for confirmation of genome and the child parents. look at the Y chromosome because it is paternally inherited is the correct answer.