[填空题]
Different species of living organisms have differhd2u.ns b c6,7hv zr/eent*zbvss90o4jr *k 7frs numbers of genes characteristic to them. The tablez* k0vrs9f47*bsr jso shows the estimated number of genes for five species.
Species Estimated number of genes
Escherichia coli (bacteria species) 4,000
Drosophila melanogaster (fruit fly) 13,000
Canis lupis familiaris (dog) 20,000
Homo sapiens (humans) 30,000
Oryza sativa (rice) 40,000
1.Using the information in the table deduce the estimated number of loci in a human genome.
Estimated number of loci in a human is .
2.Explain how a mutation can affect a characteristic.
