differences in DNA can be exploited

Question 1

define DNA probe

Answer 1

a short length of single-stranded DNA that has a known and specific base sequence complementary to part of the target allele which it binds/hybridises to. The probe is usually attached to a radioactive(X-ray)or fluorescent(UV light)label that indicates its position.
It attaches to one DNA strand too.

Question 2

what are DNA probes used for?

Answer 2

• to locate specific alleles of genes to diagnose genetic disorders
• identifies health risks which helps determine treatment
• can be used to inform genetic counselling