Several genes cause zits. Four of these genes are A, B, C, and D. The genes are all unlinked and additive. An aabbccdd individual has no zits. Each dominant allele of any gene adds one zit. AaBbCcDd was crossed to AaBbCcDd What fraction of the offspring have 3 zits? (Hint: use Pascal's triangle, (Hint2: if you figure out how many have Then just report zero, one, two...all the way up to 8 zits, how many offspring have 3.) Continued from problem #1. Now, AABBCCDD was crossed to aaBbCcDd. What is the most and the least # of zits that their offspring could have? Show work (in other words, show the genotypes that have the most and least, as well as the numbers they'll have).

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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.