Assume that in a certain population of giraffes, dark brown spots are dominant t
ID: 282662 • Letter: A
Question
Assume that in a certain population of giraffes, dark brown spots are dominant to light brown spots. If the frequency of dark brown giraffes is 24%, what is the frequency of the dark brown allele? Hint: the frequency that is provided is the frequency of a specific phenotype (i.e. not a genotype frequency). Round your answer to the nearest tenth of a percent (ie. 10.7%) Do not include the "%" sign in the box. Question 9 8 pts In a non-evolving population of wildflowers, there are 497 individuals with serrated leaves and there are 480 individuals with smooth leaves. If the allele for serrated leaves is dominant to the allele for smooth leaves, what is the expected frequency of the serrated allele? Round your answer to the nearest tenth of a percent (i.e. 10.7%). Do not include the %" sign in the box.Explanation / Answer
Dark brown spots Phenotype is produced by both homozygous dominant and heterozygous.
Frequency of dark brown spot = genotype frequency of homozygous dominant + genotype frequency of recessive = p2 + 2pq = 24% = 0.24
According to Hardy-Weinberg equilibrium,
p2 + 2pq +q2 = 1
=> 0.24 +q2 = 1
=> q2 = 1-0.24 = 0.76
=> q = 0.8718
AND p+q = 1
=> p+0.8718=1
=> p = 1-0.8718 = 0.1282
Frequency of dominant allele = p = 0.1218
Frequency of dominant allele = 0.1218 or 12.18%
Question 9:
Total = 497+480 = 977
Serrated leaves frequency (p2 +2pq )= 497/977 = 0.5087
Smooth leaves frequency (q2)= 480/977 = 0.4913
=> q = 0.7009
p = 1-q = 1-0.7009 = 0.2991
Frequency of serrated leaves frequency = p = 0.2991
Frequency of serrated leaves frequency = 0.2991 = 29.91%