There is a rare disease called ptosis which results in the a…
There is a rare disease called ptosis which results in the affected individual being unable to completely open their eyes. (I’m not making this up!) The condition is caused by an autosomal dominant allele P. A woman who has ptosis marries a man with normal eyelids. The woman’s father had ptosis, but her mother had normal eyelids. Her father’s mother (her grandmother) had normal eyelids. What is the genotype of the woman’s paternal grandmother? [1] What must be the phenotype of her paternal grandfather? [2] What proportion of the women’s children is expected to have ptosis? [3]
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