Dr. Sisko studies the flowering plant Mimulus cardinalis in an experimental popu
ID: 142843 • Letter: D
Question
Dr. Sisko studies the flowering plant Mimulus cardinalis in an experimental population of size 1,000 that grows in acidic soil. The color of the flower in this plant is determined by a single locus with two co-dominant alleles A1 and A2. Laboratory observations show that seeds from red and pink flower plants survive with equal success in the acidic soil but seeds from plants with white flowers (A2A2) have decreased fitness with a selection coefficient of s=0.2
a) Is A1 dominant, recessive or semi-dominant for fitness? Why?
b) Calculate the genotype, allele frequencies, AND average fitness of the population (w-bar) in the next generation BEFORE and AFTER selection.
Phenotype Red Pink White Number of plants (adults) 200 300 500 Fitness 1 1 1-sExplanation / Answer
a). A1 is dominant for fitness.
b). Allele frequency in the next generation before selection, p = No of copies of allele A1 in the population/ total population
= 200/1000
= 0.2
Allele frequency in the next generation after selection, q = No of copies of allele A2 in the population/ total population
= 300/1000
= 0.3
Genotype frequency p2 = 0.2 * 0.2
= 0.04
q2 = 0.3 * 0.3
= 0.09
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