Imagine that long fins in zebrafish is a dominant trait. a breeder wants to set up a breeding program beginning with homozygous dominant long-finned fish. if she obtains a handful of the long-finned fish, how can she tell which, if any, of these are homozygous for the trait?

you have to check alleles of both parents and do cross matching to see what product result from their individual alleles.

Explanation:

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