Question: In a plant species the normal flower colour is yellow.
Occasionally some individuals have white f…


In a plant species the normal flower colour is yellow.
Occasionally some individuals have white flowers. Selective
breeding demonstrates that the trait for the flower colour is found
at a single locus and that the white allele is recessive

a) In a population of 6500 flowers 6 were found to be white
flowered. Assuming Hardy-Weinberg Equilibrium calculate the gene
frequencies (p & q) for this population.

b) What assumptions do you make in carrying out the above
calculation.

c) Calculate the frequency for each genotype (genotypic
frequency)

d) How many of the flowers in this population would be
heterozygous?

e) What proportion (%) of the white alleles are found in
heterozygotes?

f) The 6494 individuals with yellow flowers are subjected to
genetic testing and it is found that 6087 are homozygous yellow and
407 are heterozygous (and, of course 6 are homozygous white). Using
this new information calculate the gene frequencies for the flower
colour locus.

g) Why are the gene frequencies in part f) different than those
calculated in a)?

h) What are the correct frequencies for this locus?

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