BI-1509
Genetic crosses and ratios
Biology · Secondary 4 · Easy · Genetic crosses and ratios
A student investigates inheritance of flower colour controlled by a single gene with two alleles, red (R) and white (r). A heterozygous red plant (Rr) is self‑fertilised. What is the expected phenotypic ratio of red : white flowers in the offspring?
- 1 red : 1 white
- 2 red : 1 white
- 3 red : 1 white
- 4 red : 0 white
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