2 and 3 are too similar to distinguish because they both are saying it's been back up on several different accounts but 3 seems like a more solid answer go with 3
One parents would have a Homozygous trait BB for blue eyes in order for the blue eyes to be shown in an offspring.
One parents could have either heterozygous (Gb) or homozygous (GG) traits for the green eye trait to appear since it is a dominant trait.
Answer: Due to crossing over and independent assortment.
Explanation: Crossing over occurs in Prophase I. It's when the homologous chromosmes switch genes with each other. This ways, genes are recombined, unique chromosmes are made!
In terms of human evolution, the sagittal crest was usually more pronounced and larger in older and robust species compared to younger or gracile species.
Hope that helped! :)
