Truncate fish on the planet of Langor have fin numbers determined by genotypes a

Question

Truncate fish on the planet of Langor have fin numbers determined by genotypes at two independent loci. If the alleles at locus 01 are A, a and the alleles at locus 02 are B, b, then consider the number of fins in each Truncate fish as a function of the two-locus genotypes presented in the table below.

Question 01. Is this model an additive model?

Question 02. Determine the formula to predict the Fin count based on the two-locus genotypes. (Hint: In addition to the standard calculations, include the product: (#A alleles) x (#B alleles)).

Question 03. Use the formula in Question 02 to compute the Fin Count for the multi-locus genotype aABb.

Please provide an explanation to the answers. Thank you.

Table 1. Fin numbers as function of two-locus genotype counts. Locus 01 Allele 01 Locus 01 Allele 02 Locus02 Allele 01 Locus02 Allele 02 Fin Count a a b b 0 A a b b 1 A A b b 2 a a B b 1 A a B b 3 A A B b 5 a a B B 2 A a B B 5 A A B B 8

Explanation / Answer

Fin count is both in even as well as in odd no.which clearly prove that it cant be a multiplicative model. Hence its a additive model.

To calculate the no.of fins, concept of Dihybrid cross need to be understood with the formula-

AB+ab+Ab+BB+ba+Bb

For aABb genotype, no. of fins will be 3.

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