Question

What can be concluded about a trait that shows a concordance of 100% in monozygotic twins and 50% in dizygotic twins?

is genetic.
a)It is caused exclusively or almost exclusively by genetic factors.
b)About 25% of the basis of the trait is genetic, while 75% of the basis is environmental.
c)About 25% of the basis of the trait is environmental, while 75% of the basis
d)It is caused exclusively or almost exclusively by environmental factors.
e)About 50% of the basis of the trait is genetic, while 50% of the basis is environmental.

Answer 1

The trait with a concordance of 100% in monozygotic twins and 50% in dizygotic twins is caused exclusively or almost exclusively by genetic factors.

Step-by-step explanation:

The trait that shows a concordance of 100% in monozygotic twins and 50% in dizygotic twins can be concluded to be caused exclusively or almost exclusively by genetic factors. This is because monozygotic twins share 100% of their genetic material, so if a trait is present in one twin, it will almost always be present in the other. In contrast, dizygotic twins share only 50% of their genetic material, so if a trait is present in one twin, it is more likely due to genetic factors rather than environmental factors.