Mary looks nothing like her mother, but Mary's daughter grows up to look exactly like Mary's mother. In other words, grandmother and granddaughter look alike. The fact that Mary's daughter looks like her (Mary's) mother but she herself doesn't is a good example of the

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The fact that Mary's daughter looks like Mary's mother suggests that there is a genetic basis for this resemblance. However, the fact that Mary herself does not look like her mother suggests that genetic factors do not always lead to a visible physical resemblance (phenotype). This illustrates the difference between genotype (the genetic makeup) and phenotype (the observable physical characteristics).

Mary Looks Nothing Like Her Mother, but Mary's Daughter Grows