Acertain species of fish can have either long or short fins. the allele for long fins is dominant over the allele for short fins. a heterozygous, long-finned fish is crossed with a homozygous, short-finned fish. of the offspring, will have long fins and be , and will have short fins and be

The offspring of long fins will be heterozygous dominant and of short fins will be homozygous recessive.

Explanation:Heterozygous long finned fish will have a genotype of Ll.Homozygous short finned fish will have a genotype of ll.The possible genotypes of their offsprings will be:Ll × , Ll, ll, ll.The probability of short-finned fish will be 1/2 and the probability of long finned fish will also 1/2.So the short-finned offspring will be homozygous recessive and long finned will be heterozygous dominant.