1.   But if both parents carry the gene, their children would have one chance in four of inheriting a copy from each parent and so getting the disease.

2.   Embryos with two Xs can become normal males if they inherit a misplaced copy of SRY on the X from their father.

3.   In that case, he said, the genes might have been advantageous to the population, even though anyone who inherited two copies of the genes would die.

4.   Leland inherited a copy from each of his parents, both of whom were symptomless CF carriers, something they did not know until they found out about Leland.

5.   Offspring inherit two copies of a gene, one from each parent.

6.   Patients only have the full-blown disease if they have inherited a copy from both parents.

7.   People inherit one copy of the gene from each parent.

8.   The children inherited defective copies of a gene that makes leptin, a hormone that signals the brain on the amount of fat in the body.

9.   The disease occurs only if a child inherits a copy of the mutated gene from each parent.

10.   The disease develops when a child inherits two copies of a defective gene, one from each parent.