[Maximum number: 2]
Research suggests that selective breeding began about 10000 years ago. Selective breeding has been important in satisfying the global demand for food.
(a)
Suggest two possible disadvantages of selective breeding.
[ 2 ]
[Maximum number: 1]
Maize, Zea mays, is a major cereal food crop. Unlike most crop plants, maize seed is produced by hybridisation between two different inbred parental strains.
(a)
(i)
Suggest one disadvantage of producing seed in this way.
[ 1 ]
[Maximum number: 1]
Maize, Zea mays, is a major cereal food crop. Unlike most crop plants, maize seed is produced by hybridisation between two different inbred parental strains.
(a)
(i)
Suggest one disadvantage of producing seed in this way.
[ 1 ]
[Maximum number: 2]
Natural selection and artificial selection (selective breeding) both have important roles in evolutionary change.
(a)
State two examples of crop features that may be improved by selective breeding to increase the yield of crops.
[ 2 ]
(a)
Humans use selective breeding to improve the features of crop plants and domestic animals.
[ 5 ]
(i)
Describe how selective breeding can be used to improve the milk yield of dairy cattle.
[ 5 ]
0