An organism's development from an embryo may contain clues about its history that scientists can use to develop relationships and build evolutionary trees. ancestral characters are often preserved in an organism's developmental stages. for example, both bird and human embryos go through a stage where they have slits and arches in their necks like the gill slits and gill arches of fish. these structures are not gills and do not develop into gills in birds and humans, but because they are so similar to gill structures in fish at this point in development scientists believe that
a) birds and humans evolved from fish.
b) all vertebrate animals have identical embryos.
c) fish, birds, and humans share a common ancestor.
d) fish evolved as a life form long before birds or humans.
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Ответ:
its actually C)fish, birds, and humans share a common ancestor.
Ответ:
5000 number of origins
Explanation:
Drosophila genome contains =
base pairs
Eukaryotic DNA polymerases synthesize = 60 nucleotides per second.
Note:DNA replication in people is bi directional.
Thus, by changing over the human DNA replication rate to the pace of drosophila replication, we get
Whereas, in 5 minutes we have 300 sec,
60 nucleotides
and
2 is bidirctional
300 sec × 60 × 2,
is equal to 36000/sec
Presently to show up at the quantity of sources of replication that is required for this pace of replication in drosophil, we need to separate as follows
rate of replication in drosophila/ rate of replication in human
= (
) / 36000
=
= 5000 number of origins