Question

Izzy has been diagnosed with unipolar depression. Family pedigree studies suggest that her identical twin sister, Cerole, would have about a _____ percent chance of also developing unipolar depression.

Answer 1

Answer:

Izzy has been diagnosed with unipolar depression. Family pedigree studies suggest that her identical twin sister, Cerole, would have about a 46 percent chance of also developing unipolar depression.

Explanation:

Twin studies with unipolar depression demonstrate a strong genetic component :

• Concordance rates for identical ( monozygotic) twins = 46%
• Concordance rates for fraternal ( Dizygotic ) twins      = 20%

Adoption studies also have implicated a genetic factor in cases of severe unipolar depression.

Using technique from te field of molecular biology, researchers have found evidence that unipolar depression maybe tied to specific genes.