Vinca (the periwinkle family) have a height determined by polygenes. The shortest Vinca grow to a full height of only 3 inches, whereas the largest Vinca is 21 inches high at maturity. If one crosses a 3-inch Vinca and a 21-inch Vinca, 12-inch Vinca result. If the F1 are allowed to interbreed, then one gets a range of plants from 3 inches to 21 inches high. However, one only obtains about eight plants in 512 that are 3 inches high and only about eight plants in 512 that are 21 inches high. What is the contribution per contributing allele? If two 12-inch (F1) Vincas are crossed, what is the probability of observing a 6-inch Vinca? If a 12-inch F1 plant is crossed to a 21-inch plant, what is the probability of observing a 15-inch plant?

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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.