The recessive gene for a certain learning disability is X-linked. ...

[casperchen82]

The recessive gene for a certain learning disability is X-linked. This means that
 
  females are twice as likely as males to have this disability.
  females will have this disability only if they inherit the gene from both parents.
  males will have this disability only if they inherit the gene from both parents.
  males can carry the gene but will not have the disability.

Question 2

Recessive X-linked genes are
 
  more likely to be expressed in a man's phenotype.
  more likely to be expressed in a woman's phenotype.
  carried on all chromosomes.
  never expressed in a phenotype.

[otokexnaru]

Answer to Question 1

females will have this disability only if they inherit the gene from both parents.

Answer to Question 2

more likely to be expressed in a man's phenotype.

[casperchen82]

TYSM

[Viet Thy]

Excellent