where deletion occurs Figure 10.12 Deletion leading to cri-du-chat syndrome Affected infants have an improperly developed larynx, and their cries sound like a cat in distress. They show severe menta retardation. A rounded face, small cranium, and misshapen ears are outward symptoms(a) Deletion occurs in a fragile region of chromosome 5(b)
基因突变 细胞质基因的变异 2不遗传的变异 五)遗传与变异的关系 genotypeenvironment=phenotype
基因突变 细胞质基因的变异 2 不遗传的变异 〔五〕遗传与变异的关系 genotype+environment=phenotype