Concordance refers to A) the degree to which identical twins ...

[lracut11]

Concordance refers to
 
  A) the degree to which identical twins are dissimilar in terms of a particular trait.
  B) the degree to which people raised in the same household disagree with each other.
  C) the degree to which identical twins are alike in terms of a particular trait.
  D) a measure of gender nonconformity.

Question 2

In several research studies, the incidence of same-gender sexual orientation was greater for those siblings of a gay male who were
 
  A) an identical twin.
  B) a fraternal twin.
  C) an adoptive brother.
  D) a half-brother.

[Moriaki]

Answer to Question 1

C

Answer to Question 2

A