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Agrodiaetus shahrami, a butterfly, has one of the highest chromosome numbers among all multicellular animals (2N=268!)....

Agrodiaetus shahrami, a butterfly, has one of the highest chromosome numbers among all multicellular animals (2N=268!). If a butterfly of this species is heterozygous for just 3 genes per chromosome, how many different gametic genotypes are possibly produced by this butterfly?

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Answer #1

The haploid set of chromosomes in the butterfly are 134 chromosomes i.e. it has 134 pairs of chromosomes

each chromosome has just 3 genes which are heterozygous rest all are homozygous. Considering a pair of chromosome which is heterozygous for 3 genes, the number of different gene combinations produced during meiosis is 2n, n is the number of genes. Therefore different combination of genes which can be produced from this particular chromosome is 23 = 8.

Every chromosme pair is heterozygous for 3 genes only, so it each pair can produce 8 different combinations of genes. In total there are 134 chromosome pairs, so 134 x 8 = 1072.

1072 different gametic genotypes are possibly produced by the butterfly.

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