1 - 10 of 44 Answers
August 6, 2019:
If a superior alien race visited Earth making a David Attenborough-like nature documentary, would their scientists consider all Homo sapiens the same, or would the different races be categorized under different Homo sapien subspecies? My question is, are all human beings technically the same exact species of Homo sapiens despite our physical differences?
June 4, 2019:
How do scientists construct phylogenetic trees and know the degree of relatedness between living organisms by DNA?
May 23, 2019:
I'm a crop and soil sciences graduate, and I'm studying different pests. Several insects, including Soybean Aphid and Alfalfa Snout Beetle, reproduce by a process called parthenogenesis. This process allows the Alfalfa Snout Beetle to all exist as females. How does parthenogenesis offer the opportunity to develop resistance to pesticide applications, then pass the traits with stability to their offspring?
October 18, 2016:
Could further research into the FOXP2 gene pinpoint when on the evolutionary timeline of Homo sapiens language developed?
July 8, 2015:
If humans have a common ancestor, why do we have different color skins?
April 1, 2015:
Developmental plasticity in evolution - would you please explain it. And how does it differ from DNA methylation?
September 26, 2014:
Since DNA mutations usually do not make us healthier, how can we have mutated from monkeys? Or did monkeys really mutate from us?
January 30, 2014:
My wife and I were chatting this morning about our children (boy and girl) and twins and then genes. It made me wonder, why any of our children have differences at all. Her ovaries are producing eggs which presumably have the same DNA. I produce sperm which I also presume to have the same DNA.
Mixing the two together, one would think all our children would be clones - which of course they are not. So what makes the difference, and more importantly WHY? Why would her body and mine produce something that is "random?” It would seem more logical to produce the same things.
October 30, 2013:
Do Neanderthal and modern humans have the same number of chromosomes (46 instead of 48 like apes) and if so, has this fact been actually scientifically shown by fossil record or is it speculated by anthropology? Also at what point in time in human evolution it is believed that the fusion of chromosome 2 occurred?
January 16, 2013:
I’ve been reading about how humans went from 48 to 46 chromosomes. How is this possible? Wouldn’t you end up with Down syndrome or something?
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August 29, 2007:
Si las teorias de la evolución son correctas, cómo es que ocurrió el cambio de 24 a 23 pares de cromosomas de "los simios" a los humanos? Cómo es posible que dos cromosomas se unan y que la nueva especie surgida sobreviva y logre reproducirse?