An experiment was conducted to examine how flower colour is inherited.
In cross 1, a blue-flowered plant (plant G) was pollinated with pollen from another blue-flowered plant (plant H). The seeds produced were gathered and labelled ‘batch 1’.
In cross 2, plant G was pollinated with a white-flowered plant (plant J). The seeds produced were gathered and labelled ‘batch 2’.
All of these plants belonged to the same species.
Fifty seeds from each of batch 1 and batch 2 were allowed to grow, and the number of plants with white flowers was recorded.
The findings are presented in Table 3.1.
(a)[1]
State the dominant phenotype in this experiment.
(b(i))[3]
Give the genotypes of:
plant G [BLANK]
plant H [BLANK]
plant J [BLANK]
(b(ii))[1]
State which of these plants is heterozygous.
(c)[5]
In the box below, draw a genetic diagram for cross 1, involving plants G and H.
Worked solution & mark scheme
This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “blue flowers” …