Pure-breeding ancient varieties of chickpeas can be black, brown, green or red in color. A new tan colored chickpea was isolated and shown to be pure-breeding. To determine the genetic basis of color inheritance in chickpea many crosses were made between the various varieties. The results are shown in the table below. Cross F2 offspring ratio % red % brown F1 phenotype F2 offspring ratio Cross F1 phenotype black x brown all black % black % brown all red brown x red % green % black % black % red all green brown x tan all tan % tan % brown black x green black x red all green all green % green % red % green % tan % red ¼ pink % all black green x red black x tan all black % black % tan green x tan brown x green all green % green % brown red x tan all pink tan A. Analysis of the F2 offspring indicates that a single gene locus determines skin color in chickpea. Explain why? B. From the choices below, determine which mode of inheritance controls chickpea skin color in the ancient varieties? Complete dominance Incomplete dominance series Codominance Dominance series Lethal genes Recessive epistasis Dominant epistasis C. List the dominance relationship between the alleles of the ancient varieties of chickpea (black, brown, green, and red)

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Inheritance and Mendelian Genetics

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