Consider a trait caused by two loci - the color1 locus and the color2 locus. At the color1 locus there are two alleles (C1 and c1). At the color2 locus there are also two alleles (C2 and c2). At the color1 locus, each allele affects the phenotype as follows - C1: +0.15, c1 = -0.01. At the color2 locus, each allele affects the phenotype as follows - C2: +0.25, c2 = -0.10. What is the additive genetic effect of the following genotype C1c1C2C2 (give your answer to two decimal places)?

The total additive genetic effect = 0.64

Explanation:

For C1c1C2C2, we are assuming that additive effect of C2C2 will result in a co-dominant trait that is totally different from the original one at both of the color1 and color2 loci.

The total additive genetic effect = C1c1C2C2 = (+0.15) + (-0.01) + (+0.25) + (+0.25) = 0.64

Extrinsic postzygotic isolation.

Explanation:

Extrinsic postzygotic isolation makes a hybrid zygote unable to develop into a viable, fertile adult. This is the case with the hybrid butterflies having intermediate/medium wing patterning/color who are unable to produce viable offspring. The reason behind this change could be ecological or behavioural