Prenatal testosterone can alter the baby's phenotype, but can it alter the baby's genotype? Something has to alter the baby's genotype (more specifically, the

Prenatal testosterone can alter the baby's phenotype, but can it alter the baby's genotype? Something has to alter the baby's genotype (more specifically, the genes in germ line cells, which are the only cells whose genetic material gets passed on to offspring) in order to count as a method of heritability. Otherwise prenatal testosterone is the same as any other thing in the environment which can alter an organism's phenotype.