Fig. 10.1 presents the outcome of crossing a red-flowered plant with a white-flowered plant.
Each parent plant was homozygous for flower colour.
Every offspring produced had red flowers.
(a(i))[1]
State the meaning of the term homozygous.
(a(ii))[1]
Describe the evidence in Fig. 10.1 that shows R is the dominant allele for flower colour in this plant species.
(b)[5]
Complete the genetic diagram to show the outcome of this cross.
red-flowered plant \times white-flowered plant
parental genotypes ............... \times ...............
parental gametes ........ ........ ........ ........
offspring genotypes ...............
offspring phenotypes ...............
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “contains two identical alleles (for a particular gene)” …