A plant geneticist is examining the mode of inheritance of flower color in two closely related species of exotic plants.  The first species may have two pure-breeding lines—one produces a distinct red flower; and the other produces flowers with no color at all, or very pale yellow flowers.  However, she cannot be sure.  A cross of these varieties produces all pink-flowered progeny.  The second species exhibits similar pure-breeding varieties; that is, one variety produces red flowers; and the other produces an albino or very pale yellow flower.  A cross of these two varieties, however, produces orange-flowered progeny exclusively.  Analyze the mode of inheritance of flower color in these two plant species.

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Inheritance and Mendelian Genetics

Inheritance means the passing of traits to offspring from parents. These traits could be passed either through asexual reproduction or sexual reproduction. The offspring receives the genetic material from the parents. Mendelian inheritance is a certain biological inheritance that follows the rules and principles laid down by Gregor Mendel in 1865. The initial hypothesis was considered wrong, but other inheritance theories modified the concept of inheritance and thus genetics.