Patti is passing on a mutated gene on her X chromosome. Why is her son more likely to express the mutation in his phenotype than her daughter is?
a) Males are more likely to inherit the bad copy of a gene whenever there is one.
b) Males do not have a second X chromosome that might have a good copy of the gene.
c) Estrogen will silence a mutated gene once her daughter experiences puberty.
d) Her daughter's Y chromosome will probably have a good copy of that gene to offset the bad one.
Answer: b
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