Listeria bacteria can contaminate fresh produce, like cantaloupes, as well as some processed foods, like cheeses. Symptoms of infection include fever, muscle aches, upset stomach, or diarrhea -- occurring 2 days to 2 months after exposure. Safety: Scrub raw produce and dry before cutting.
Here the relation between genotype and phenotype is illustrated, using a Punnett square, for the character of petal colour in a pea plant. The letters B and b represent genes for colour and the pictures show the resultant flowers.n the case of an albino with a recessive allele (aa), the phenotype depends upon the other allele (Aa, aa or AA). An affected person mating with a heterozygous individual (Aa or aA, also carrier) there is a 50-50 chance the offspring will be albino's phenotype.
Start with the known genotype, bb. It makes up 0.25 of the population, the frequency of the b allele is sqrt(0.25) = 0.5. If the frequency of b = 0.5, then the frequency of B is 1-0.5 = 0.5. Using the H-W equations, q = 0.5 and p = 1 - q = 0.5.Equation #2, pâ2 + 2pq + qâ2 = 1 becomes 0.25 + 0.5 + 0.25 = 1.ince you know that q^2 = 25/100 = 0.25, just take the square root to find the allele frequency of q. (q^2)^1/2 = 0.5 Lastly, since p + q = 1 always, the frequency of the dominant allele p is 1 - q = 1 -.5 = 0.5. Source(s): green_commander Â· 5 years ago.