On the planet Kermit, in the Muppet population, there are two autosomal loci of
ID: 133033 • Letter: O
Question
On the planet Kermit, in the Muppet population, there are two autosomal loci of interest. The first locus has alleles A and a, and the second locus has alleles B and b. Both code for hair color:
Locus 01
A = Blue hair;
a = Green hair.
Locus 02
B = Blue hair;
b = Green hair.
The A and B alleles are dominant for their respective loci.
Suppose an aaBB Muppet male mates with an AAbb Muppet female. The couple produces multiple offspring, and a pair of the F1 Muppets intercross to produce several hundred offspring offspring. The counts for each pair of phenotypes are as follows:
Table 1. Counts of F2 phenotype pairs from F1 Muppet intercross
The results presented in Table 1 suggest that:
A. Locus 01 and Locus 02 act in a duplicate dominant epistatic manner in this population.
B. Locus 01 and Locus 02 act in a dominant epistatic manner in this population.
C. Locus 01 and Locus 02 act in a duplicate recessive epistatic manner in this population.
D. Locus 01 and Locus 02 act in a non-epistatic manner in this population.
E. There is 0 recombination between Locus 01 and Locus 02.
Phenotype pair Count Green Hair 99 Blue Hair 1521Explanation / Answer
The answer is
A. Locus 01 and Locus 02 act in a duplicate dominant epistatic manner in this population.
As the observed values almost fit to 15: 1 ratio, which indicates that those two genes intereacted as Duplicate dominant genes. Here the dominant phenotype is blue and recesseive phonetype is green. In this Duplicate dominant gene interaction the presence of dominant gene in either locus gives the same phenotype and where the the complete absence of dominant allales at both loci results the recesseive phenotype.
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