Suppose a geneticist uses a three-point testcross to map three recessive, linked hummingbird wing-shape mutations called tn, f and b, where tn is associated with thin wings, fis associated with flat wings, and b is associated with blunt wings. He first crosses homozygous blunt birds to homozygous thin, flat birds. Next, he testcrosses the F₁ progeny to thin, flat, blunt birds. He obtained the results shown. Given this data, label the progeny phenotypic classes as either parental, single crossover (SCO), or double crossover (DCO) recombinant types. Each label may be used multiple times. Two classes have already been filled in. Phenotype blunt thin, flat flat thin, blunt thin flat, blunt thin, flat, blunt wild type Number 821 785 171 191 7 7 28 24 Recombinant type SCO SCO Answer Bank parental SCO DCO

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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.