 With each successive backcross, there is an increase in the percentage of C57B/6J DNA that constitutes the genome of the offspring  . Backcrossing may be deliberately employed in animals to transfer a desirable trait in an animal of inferior genetic background to an animal of preferable genetic background.
<meaning-changed>  With each successive backcross, there is an increase in the percentage of C57B/6J DNA that constitutes the genome of the offspring  . Backcrossing may be deliberately employed in animals to transfer a desirable trait in an animal of inferior genetic background to an animal of preferable genetic background.
 With each successive backcross, there is an increase in the percentage of C57B/6J DNA that constitutes the genome of the offspring is increased . Backcrossing may be deliberately employed in animals to transfer a desirable trait in an animal of inferior genetic background to an animal of preferable genetic background.