Question
Question: In a certain species of sweet pea plant, flowers are either purple or white. Colour is determinted b...
In a certain species of sweet pea plant, flowers are either purple or white. Colour is determinted by two unlinked genes. The alleles of the first gene are X x; those of the second gene are Y and y.
In order to bear purple flowers, a plant must possess at least one X and one Y allele. Those genotypes which fail to do so, result in the formation of white flowers.
If two purple-flowered plants of genotype XxYy are crossed then the expected phenotypic ratio of offspring would be
A
12 purple 4 white
B
9 purple 7 white
C
10 purple 6 white
D
8 purple 8 white
Answer
9 purple 7 white