Three pairs of brown rats were crossed. These crossings produce progenies with the following ratios: Pair 1: All the progenies were brown. Crossing between these progenies produced an F2 generation with all brown rats. Pair 2: About ¾ of the F1 progenies are brown and ¼ are white. If a pair of white F1 progeny is crossed, it will produce progenies that are all white. But if a pair of brown F1 progeny is crossed, not all F2 progenies are brown. Pair 3: All the F1 progenies were brown. When these progenies are crossed with white rats, half of the F2 progenies are white and half are brown. Based on the information given above, answer these questions: (a) How many genes are involved in controlling the coat colour of rat? (b) Give suitable symbols to represent all the genes. (c) Draw cross diagrams to describe all the crosses.

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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.