Question:- Incomplete dominance is observed in snapdragon flower color; homozygous dominant individuals appear red, homozygous recessive individuals appear blue, and heterozygous individuals appear purple. Of the 60 plants in your snapdragon patch, 25 have blue flowers, 30 have purple flowers, and 5 have red flowers. What is the observed frequency of the dominant allele?
Group of answer choices
33.33%
38.33%
58.33%
16.67%
66.67%
Answer: 1. 33.33%
Explanation:
In all, 60 plants are present.
Genotypes:
There are 25 plants rr (recessive homozygous).
30 plants are Rr (heterozygous)
There are 5 RR plants.
Total alleles:
There are 50 r alleles in the plants.
30 plants by 2 alleles per plant means there are sixty- two different allele (thirty R and thirty r).
There are 5 plants; each plant has two alleles, which makes a total of ten R Alleles.
Therefore, the total alleles will be 120.
Number of R alleles = 30 (from rr) +10 (from RR) =40
Frequency of R = Number of the allele ‘R’ / Total number of alleles
= 40 / 120
= 33.33% ( Khan Academy, 2024)
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