Terrence Howard on biology: what the evidence says · JRE #2152
SUBJECT: BIOLOGY
Not a true/false call. Every claim is logged with its sources; read the exhibits below.
If we are 98.7% identical to simians, right, and there's only 1.3% differentiation, who's more evolved? But you look at the simians, they have 48 chromosomes, we only have 46. Where did that change occur?
What the evidence says 01 / RECORD
Howard claimed humans are 98.7% genetically identical to chimpanzees and asked how humans came to have 46 chromosomes instead of the 48 found in great apes, framing the latter as an unexplained mystery. Genomic studies place human-chimpanzee sequence identity in a similar range, commonly cited around 98.8% for single-nucleotide substitutions in aligned regions, though the exact figure varies (roughly 95-99%) depending on whether insertions, deletions, and structural variants are included in the comparison. The chromosome difference is well characterized: molecular genetic studies have identified vestigial telomere sequences fused head-to-head and a degraded second centromere in the middle of human chromosome 2, showing it originated from the end-to-end fusion of two separate ancestral chromosomes that remain distinct in chimpanzees, gorillas, and orangutans. This fusion event is a documented, peer-reviewed finding in comparative genomics, not an open question in the scientific literature. The premise that species with fewer chromosomes or higher sequence similarity are therefore "more evolved" is not a standard interpretation in evolutionary biology; chromosome number and overall similarity percentage do not correlate with evolutionary sophistication or recency.