CAIE IGCSE Biology 18.3.2 Steps in Selective Breeding
Practise describing how humans select, cross and reselect organisms to develop a desirable inherited feature.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- select parents that show the desired feature and cross them to produce offspring
- choose offspring with the desired feature and use them as parents for the next generation
- apply the sequence to contexts such as body mass, flowering time, resistance or yield
18.3.2—Selective breeding with reference question 1
[Maximum number: 3]
Anthocyanin is a red pigment found in carnation flowers. Some carnation plants have a gene for making anthocyanin.
A flower grower bred red carnations.
Describe how growers selectively breed plants.
1 cross / breed, (parent) plants with desired feature ;
2 (grow seeds and) chose offspring for (desired) feature(s) ;
3 cross (offspring) plants showing features with, original variety / self/each other ;
4 keep / many generations of, crossing and selecting ;
5 any detail ; e.g. bagging flowers/transfer of pollen (with paintbrush)/detail of seed collection
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