Answer;
A skull from genus Homo that dates from approximately 750,000 years ago is discovered. Then the foraman magnum is most likely be located at the bottom of the skull.
Explanation;
Foramen magnum is a large opening at the base of the skull through which the spinal cord exits the cranial vault. It is situated in the occipital bone, and forms around the base of the brainstem, separating the brain from the spinal cord. In apes and humans (members of genus homo) it is formed by the fusion of the four parts of the occipital. In human for example; it is anteriorly positioned, with its interior lying on the bitympanic line and is also inferiorly oriented.
One evolutionary trend is that as you move from simpler animals to more complex animals, Systems become more specialized.
I think the phenotype of a genotype tt (from the question) will show shortness which homozygous with two similar alleles for shortness trait. Therefore; since the t trait is recessive over the T allele which is dominant, Tt, -will be a tall pea plane, TT- tall (homozygous), tT- tall ( heterozygous), tt -short (homozygous).
