[问答题]
The majority of the genes in //x2,e cmkhmmc3w()zhq7caw the human genome have already nf8 *yw u,js w9d*ko(abeen mapped, meaning the exact locations of the genes on chromosomes are known. The diagram below shows o,9dojf(n* 8kww*syu ane representation of a homologous pair of chromosomes.
1.Define locus.
2.Identify the number of loci shown in the diagram.