Duchenne Muscular Dystrophy (DMD) is a sex- linked, recessive disease in which a mutation in the gene for dystrophin results in muscle cell degeneration. A normal man marries a woman who is a carrier for DMD. a) What are the parent genotypes? b) What are the four possible offspring genotypes from this cross? HINT - do a Punnett Square to figure this out! c) If they have four sons, how many of them will have DMD? C d) If they have eight children, how many will be carriers of DMD? BONUS (+1): Why are males more often affected by sex-linked disorders than females?

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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.