Rock worms are hermaphroditic. Red rock worms always mate with red rock worms. B

Question

Rock worms are hermaphroditic. Red rock worms always mate with red rock worms. Black rock worms likewise only mate with black rock worms. Occasionally, during severe droughts, the two forms will intermate. A red rock female with a black rock male always produces red offspring. A black female with a red rock male always produces black rock offspring. The matings are so isolated temporally and spatially that typically the offspring will intermate as well for several generations. In red rock offspring of the third filial generation, about one in four are black. In cases of black hybrid rock offspring inter matings, about three in four are red in the third filial generation. What is happening? Give the appropriate terminology and explain it. In your explanation, also use diagrams of each generation with genotypes, phenotypes and expected ratios.

Explanation / Answer

Answer:

Case:1 Red rock female crossed with black rock male then 100% red rock offsprings are produced during F1 generaton. In F2 generation one in four are black (3:1)

Case:2 Black rock female crossed with red rock male then 100% black rock offsprings are produced during F1 generation. In F2 generation three in four are red (3:1)

This is because of the hermaphrodite character of the worms. It means worms have both male and female characteristic features.

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