It is difficult to distinguish the physiological races in morphology, usually relying on ( ) to distinguish them. A: differential hosts B: phenotype C: genotype D: pathogenicity

In human, brown eyes (B) is dominant to blue eyes (b). The gene is located on autosome. A couple both with brown eyes has a son with blue eyes. We can know that the genotype of the couple are heterozygotes. A: 正确 B: 错误

Which of the following is evidence of variation within a population? A: a mutation in a genotype produces a new phenotype of an individual B: a particular species becomes rare in its native habitat C: changes in climate interrupt the life cycle of a native plant D: a genetically modified plant is created in a lab

一位病人患有丙肝，Genotype 1， 医生计划使用Harvoni治疗，请问什么情况下疗程为12周？（） A: 病人过去未使用过干扰素治疗，病毒数量少于6百万单位每毫升，无肝硬化 B: 病人过去未使用过干扰素治疗，病毒数量少于6百万单位每毫升，有肝硬化 C: 病人过去使用过干扰素治疗且复发了，病毒数量少于6百万单位每毫升，有肝硬化 D: 以上皆不是

一位病人患有丙肝，Genotype 1， 医生计划使用Harvoni治疗，请问什么情况下疗程为12周？（） A: A病人过去未使用过干扰素治疗，病毒数量少于6百万单位每毫升，无肝硬化 B: B病人过去未使用过干扰素治疗，病毒数量少于6百万单位每毫升，有肝硬化 C: C病人过去使用过干扰素治疗且复发了，病毒数量少于6百万单位每毫升，有肝硬化 D: D以上皆不是

【多选题】A man has genotype A1A2 G1G2. (one each of the A1 and A2 alleles of gene A, one each of the G1 and G2 alleles of gene G ) The A and G loci are on difference chromosomes. What gametes will many meioses produce, in what proportions? A. 1/2  A1A2, 1/2  G1G2 B. 1/4  A1A1, 1/4 A1G1,  1/4 A2G1, 1/4 G1G2 C. 1/4 A1, 1/4 A2, 1/4 G1, 1/4 G2 D. 1/4 A1G1, 1/4 A1/G2, 1/4 A2G1, 1/4 A2G2 E. None of the above F. More information is needed