In a large town of 8000 people that mates at random for the ABO system, 25% have blood group O and 39% have blood group A. The alleles are I^A, I^B and i, and the population is in Hardy-Weinberg equilibrium. How many people are expected to have the genotype I^Ai? Give a whole number.

BiologyHardHigh School (11–12)Heredity and Evolution › Evolution Olympiad

In a large town of $8000$ people that mates at random for the ABO system, $25\%$ have blood group O and $39\%$ have blood group A. The alleles are $I^{A}$ , $I^{B}$ and $i$ , and the population is in Hardy-Weinberg equilibrium. How many people are expected to have the genotype $I^{A}i$ ? Give a whole number.

Type your answer as a number (a decimal point is allowed). A wrong answer may cost marks.

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← Three genes, A, B and C, control a polygenic trait in a plant, and each dominant allele adds the same amount to the phenotype. A plant AaBbCc is crossed with a plant aabbcc. How many phenotypic classes appear among the offspring, and what is the largest fraction of the offspring found in any one class?A cross is expected to give a 3 : 1 ratio of dominant to recessive plants. A sample of 240 plants is counted. The test uses the chi-square statistic and the critical value 3.84 (5% level, 1 degree of freedom); the ratio is rejected when chi-square is greater than this value. Fewer recessive plants than expected are found. What is the largest number of recessive plants in the sample at which the 3 : 1 ratio is still rejected? →

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