6. In a population of angiosperms in Hardy-Weinberg equilibrium, the allele, C, conferring red flowers is completely dominant to the allele, c, causing white flowers. If allele C is at frequency 0.7 in the population, what is the expected frequency of red flowered plants

The correct answer is - 0.91.

Explanation:

Given that C is dominant over c with an allelic frequency of 0.7. The sum of the frequency of dominant alleles and the frequency of heterozygous alleles in this H-W population of angiosperm will be the expected frequency of red-flowered plants.

The frequency of C = 0.7

(p² = dominant allele frequency)

Then, the frequency of dominant genotype CC would be = 0.7×0.7 (p² = dominant allele frequency)

As we know that P + q = 1

then q = 1 - p

q (frequency of recessive allele) - 1 - 0.7

q = 0.3

Then frequency of heterozygous genotype Cc= 2pq

= 2×0.7×0.3

= 0.42

The frequency of red flowers = freq of CC + freq of Cc

= 0.49 + 0.42

= 0.91