Ok i will answer yo question but what does infant mean
If
an animal's heart has three chambers and it lays amniotic eggs, it should be a reptile
(e.g. pythons and monitor lizards). However, through amniotic egg, a protective
adaptive sac inside the egg, it os useful for reptiles, amphibians, birds and
mammals.
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A GWAS can be performed by actually genotyping as few as 300000 to 1million
I would say its the first option. Hope this helped.