1. Jean Manning, Charles Kerfoot, and Edward Berger studied the frequencies at t
ID: 22291 • Letter: 1
Question
1. Jean Manning, Charles Kerfoot, and Edward Berger studied the frequencies at the phosphoglucose isomerase (GPI) locus in the cladoceran Bosmina longirostris. At one location, they collected 195 animals from Union Bay in Seattle, Washington, and determined their GPI genotypes by using electrophoresis. They counted the following # for each genotype: S1S1 = 7; S1S2 = 52; S2S2 = 136. What is the frequency of S1? (answer to 2 decimal places). Is this population in Question 4 in Hardy-Weinberg equilibrium?2.Researchers cross a corn plant that is pure-breeding for the dominant traits colored aleurone (C1), full kernel (Sh), and waxy endosperm (Wx) to a pure-breeding plant with the recessive traits colorless aleurone (c1), shrunken kernel (sh), and starchy (wx). The resulting F1 plants were crossed to pure-breeding colorless, shrunken, starchy plants. Counting kernels from about 30 ears of corn, The following results are reported.
Kernel Phenotype: Number
Colored, shrunken, starchy: 116
Colored, full, starchy: 601
Colored, full, waxy: 2538
Colored, shrunken, waxy: 4
Colorless, shrunken starchy: 2708
Colorless, full, starchy: 2
Colorless, full, waxy: 113
Colorless, shrunken, waxy: 626
total = 6708
What is the interference value ?
3. In a diploid species of plant, the genes for plant height and fruit shape are one the same gene and separated by 18 m.u. Allele D produces tall plants and is dominant to d for short plants, and allele R produces round fruit and is dominant to r for oval fruit. A plant with the genotype DR/dr produces gametes. Identify gamete genotypes, label parental and recombinant gametes, and give the frequency of each gamete genotype.
a. Parental: 9% Dr, 9% dR; recombinant: 41% DR, 41% dr
b. Parental: 41% Dr, 41% dR; recombinant: 9% DR, 9% dr
c. Parental: 9% DR, 9% dr; recombinant: 41% Dr, 41% dR
d. Parental: 41% DR, 41% dr; recombinant: 9% Dr, 9% dR
Explanation / Answer
Interference is 0.861
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