Edexcel IGCSE Biology 3.33 variation within a species
Practise variation questions by classifying traits from evidence and explaining how genetic or environmental differences affect survival.
- Syllabus
- First assessment 2019
- Course
- Biology 4BI1
Exam points
- Classify characteristics as gene-only, environmental, or affected by both genes and environment.
- Use data tables to explain how variation can improve survival in changing conditions.
- Suggest genetic and environmental reasons for measured differences within a species.
3.33 Variation within a species question 1
A species of grass has a diploid chromosome number of 12.
Scientists use this method to investigate self-pollination and cross-pollination in a species of grass plant.
- take pollen grains from the anther of a flower
- place some of the pollen grains on the stigma of the same flower
- after one day, count how many of the pollen grains grow a pollen tube
Repeat the method but place the pollen grains on the stigma of a flower of a different plant.
The table shows the scientists' results.
Explain how the results of the investigation show that this species of grass plant is able to survive in a changing environment.
Use the information in the table to support your answer.
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