Edexcel IGCSE Biology B Selective Breeding Questions
Practise selective breeding by tracing parent choice, offspring selection and repeated breeding in crops, cattle, fish and dog populations.
- Syllabus
- First assessment 2019
- Course
- Biology 4BI1
Exam points
- describe selecting parents with desired traits, breeding offspring and repeating over generations
- compare selective breeding with genetic modification using source of DNA and speed
- apply breeding steps to plant yield, milk yield, rapid fish growth or harmful alleles
Covered syllabus points
Question 1
The diagram shows a flower with some structures labelled.
A farmer has two varieties of a plant species.
One variety has a red flower colour and no scent.
The other variety has a white flower colour and a perfumed scent.
The farmer wants to produce a variety that has the red flower colour and the perfumed scent.
Explain how the farmer could achieve this.
Question 2
Reflexes are responses that protect the body and involve the central nervous system (CNS).
The photograph shows a breed of dog called a border collie.
Some border collies have a genetic condition called sensory neuropathy.
Border collies with sensory neuropathy may be injured as their reflexes do not work well.
Sensory neuropathy is caused by a recessive allele, n . The dominant allele for not having sensory neuropathy is N .
The diagram shows a family pedigree for some border collies.
Dog breeders use selective breeding to try to remove harmful alleles from dog breeds.
Explain how selective breeding could be used to remove the allele for sensory neuropathy from a population of border collies.
Question 3
Scientists can produce new varieties of plants by genetic modification.
Scientists can also produce new varieties of plants by selective breeding.
Give two differences between the use of genetic modification and selective breeding to produce new varieties of plants.
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