Bahadur Singh is a Ph.D. research fellow in Department of Anthropology, Panjab University, Chandigarh. He is working on the variations in spatial gait patterns of young adults and their possible use in forensics. He also did work on the multi-fregmentations of heavy metals at intermediate energies. He is also interested in fossils, stone tools, archaeology and evolutionary theories.
Primary Affiliation: Department of Anthropology, Panjab University - Chandigarh, Chandigarh , India
We describe a fossil freshwater crab specimen from the Tatrot Formation, Siwalik Group, of Northern India. We assign this specimen on the basis of morphology of the anterolateral margin, which is comparable to the extant species Acanthopotamon martensi (Wood-Mason, 1875) in the Ganges valley. We re-interpret previously described claw fragments from the same formation that have been assigned to the gecarcinucid species Sartoriana spinigera ( Wood-Mason, 1871). This casts doubt on previous approaches to calibrate a molecular clock for primary freshwater crabs that used these fossils as minimum age of Sartoriana spinigera. However, the present findings allow setting a confident lower age constraint for the appearance of A. martensi to get a more accurate estimate for nucleic acid substitution rates. The age of fossil Acanthopotamon martensi based on the magnetostratigraphy of the Tatrot Formation is ∼2.6 Ma (latest Pliocene).
In April 2015, the editing of the genome of human embryo with the help of CRISPR/Cas9 by Chinese scientists has generated a worldwide debate for its unpredictable effects on humans in the times to come. Though editing human germ line genes can be of advantage to curb serious genetic disorders, it poses a possible threat to the human society for the fear of the unknown.