本题目来源于试卷: Continuity and Change D.8 Inheritance，类别为 IB生物学
[单选题]
The diagram shows a 8 3t np (s2h;puqjxt:xh,7nqmjme7ttyi9 +an z fr+oh)47p9lpair of homologous chromosomes.
How many loci are shown?
A. 1
B. 2
C. 4
D. 8
参考答案: C
本题详细解析:
A locus is the location of a gene, regardless of the allele. Homologous chromosomes have genes for the same characteristics, therefore, also the same loci. The diagram shows alleles for four genes because they are in the same location. The location of four genes is shown (Choice C). There is one pair of homologous chromosomes (Choice A). There are two chromosomes (Choice B). There are eight alleles shown (Choice D) but only 4 loci.
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