Mendelian Inheritance of Dorsal Spines
A scientist determines that the number of dorsal spines in a species of fish is controlled by a single locus. A fish with one dorsal spine is mated with a fish of the same species with two dorsal spines. The mating produces ten offspring, all of which have one dorsal spine. Which of the following statements is inconsistent with these results?
A
The parent fish with one spine has a homozygous genotype at the dorsal spine locus.
B
All offspring are homozygous for the one-spine allele.
C
Having two dorsal spines is a recessive phenotype.
D
The parent fish with two spines has a homozygous genotype at the dorsal spine locus.
E
The offspring may be capable of producing progeny with only one spine.
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