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Inflated pod plants from the F1 generation were crossed with their constricted pod parents to produce a total of 480 offspring - VCE - SSCE Biology - Question 32 - 2015 - Paper 1
Question 32
Inflated pod plants from the F1 generation were crossed with their constricted pod parents to produce a total of 480 offspring. The expected numbers of offspring wi... show full transcript
Worked Solution & Example Answer:Inflated pod plants from the F1 generation were crossed with their constricted pod parents to produce a total of 480 offspring - VCE - SSCE Biology - Question 32 - 2015 - Paper 1
Step 1
Calculate the ratio of the expected offspring phenotypes
Answer
The phenotypic ratios from the given data are as follows:
- 280 inflated : 0 constricted indicates that all offspring are inflated.
- 210 inflated : 70 constricted shows a ratio of 3:1, which is typical for a monohybrid cross.
- 70 inflated : 210 constricted suggests a reverse count, possibly indicating an abnormal phenotype ratio due to environmental factors.
- 140 inflated : 140 constricted indicates a 1:1 ratio, often observed in a dihybrid cross.
To summarize, the phenotype ratios indicate varying dominance relationships and understandings of inheritance patterns.
Step 2
Discuss the implications of the results
Answer
These results illustrate the principles of Mendelian genetics, showcasing the expected ratios from monohybrid and dihybrid crosses. The presence of variations suggests potential environmental impacts or mutations affecting phenotypic expression, thereby providing insights into plant traits and breeding strategies.