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Paper 4Theory (Extended)3 marks
Using offspring phenotypes to interpret a test cross.
Data Table
Offspring Phenotypes from a Test Cross
A plant with an unknown genotype showing a dominant trait is crossed with a homozygous recessive plant. The following offspring were observed:
| Phenotype | Number of Offspring |
|---|---|
| Dominant trait | 50 |
| Recessive trait | 50 |
- a[1]
Identify the genotype of the unknown parent plant based on the offspring data.
Aim for approximately 1 distinct marking point.
- b[2]
Explain why the offspring show this ratio of phenotypes.
Aim for approximately 2 distinct marking points.
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