Rules for marriage outside of a group are called _______________. ...

[fbq8i]

Rules for marriage outside of a group are called _______________.
 
  Fill in the blank(s) with correct word

Question 2

What is meant by the statement, natural selection is the one factor that can cause directional change in allele frequency relative to specific environmental factors?
 
  What will be an ideal response?

[beccamahon]

Answer to Question 1

exogamy

Answer to Question 2

It means that if the environment changes, then selective pressures change and allele frequencies
shift in response.

[fbq8i]

Thanks for the timely response, appreciate it

[alvinum]

TYSM