A plant breeder wants to produce a crop variety that contains a particular desirable allele. Seedlings can be screened using a DNA probe for the allele, instead of waiting for the mature plants to show the characteristic.
Explain how a DNA probe can identify seedlings that contain the desirable allele.
[2]
Suggest the advantages to the breeder of screening seedlings with a probe rather than growing the plants to maturity.
[3]