CAIE A-Level Biology A2 17.2.7 Selective Breeding Examples Questions

Practise applying breeding principles to resistant or high-yield crops, vigorous uniform maize hybrids and milk-yield selection in dairy cattle.

Exam points

Apply repeated selection and crossing to improve disease resistance, yield or other useful traits in wheat and rice, then verify that selected offspring carry the required alleles.
Explain maize inbreeding to form uniform homozygous lines, then hybridisation to produce vigorous heterozygous F1 plants.
Design and evaluate dairy-cattle milk-yield breeding using female records, male relatives or progeny tests across slow generations.

[Maximum number: 5]

Humans use selective breeding to improve the features of crop plants and domestic animals.

Describe how selective breeding can be used to improve the milk yield of dairy cattle.

All question bank results loaded