Using scenario 1 describe wheter the B allele frequency, and R allele frequency will increase, decrease, increase and decrease or remain the same
Using scenario 1 describe wheter the B allele frequency, and R allele frequency will increase, decrease, increase and decrease or remain the same
Before introduction of the predatory fish, the frequencies of both the alleles is equal. The predatory fish here is the selection agent, and it selects black spots against the red spots due to its ability to be able to pick up the color red better.
The alleles B and R are given to be codominant; this means that when present together, like in a heterozygote, both will be expressed. The BR genotype will have the phenotype of dots of both color mixed.
Assuming that the cue is the presence of red spots only, a heterozygote would be as susceptible to predation as the homozygote red, since the heterozygote will express both red and black spots. However, it is more likely that the rate of predation will be higher for the red spotted fish than the one with mixed spots.
Rate of predation will be
Red spots > mixed spots > blacks spots
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