Fig. 1 shows a white sweet pea flower and a red sweet pea flower.
Fig. 1
These colours in sweet pea are controlled by a single gene with two alleles.
Define the term allele.
A homozygous sweet pea with white flowers was crossed with a homozygous sweet pea with red flowers. All of the offspring had red flowers.
State which allele of this gene is dominant.
Two heterozygous sweet pea plants with red flowers were crossed as shown below.
Draw a Punnet square to show the genotypes that are produced in this cross.
[2]
State the phenotypic ratio produced in this cross.
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