[填空题]
Different species of living organisms have different numbe-1 izu5 ,ipitkrs of genes characz,lh(gxaomif d2 v z7b9ch9+;teristic to them. The table showz cihgma ;xh+92bf7 (9 ,vzolds 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.
