I think the nuclear membrane begins to break down, and the pair of chromosomes look like their are floating in the air.
251 million years ago, the Permian extinction occurred. It is the widest and most massive extinction that wiped out 85-90% of marine species and 70% of land vertebrates at that time. There were recorded low oxygen levels in deep and shallow oceans, extreme shift in the carbon cycle, massive eruption of a basal salt volcano in Siberia and the consecutive global warming that occurred evidently ended early prehistoric life.
The correct answer is Francis Galton.
He discovered three kinds of a pattern of fingerprints, that is, arches, loops, and whorls. Arches are witnessed in approximate 5 percent of the patterns of fingerprints encountered. Loops take place in approximately 60 to 70 percent of the patterns of fingerprints encountered.
While the whorls are witnessed in about 25 to 35 percent of the pattern of the fingerprints encountered.
Explanation:
Homologous chromosomes are 2 physically different chromosomes that have the same genes but are not genetically identical. Sister chromatids are 2 copies of a single chromosome and so are genetically identical (they also are physically attached to one another).
