BIOL 101 1st Edition Lecture 14 Outline of Last Lecture I Errors in Meiosis II Inherited Traits a Alleles b Dominance Outline of Current Lecture I Law of Equal Segregation II Alleles III Single Gene Crosses Current Lecture I The Law of Equal Segregation a sperm or egg carries only one allele for a single gene because alleles segregate away from each other during meiosis Pleiotropy several phenotypes for one allele Polygenic inheritance multiple genes influencing one phenotype APPLY WHAT YOU KNOW Add alleles to the cell shown below black oval A White oval A Black cylinder B white cylinder b black rectangle C white rectangle c II Single gene crosses applying Mendel s Law of Equal segregation Using punnett squares to make a cross example A a x A a What are the gametes that will form from each parent These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute A and a from each parent Genotypes of parents crossed A A x a a A a x A a A a x A A A AAa x a a Genotypes of offspring Aa AA Aa aa AA Aa Aa aa Thinking like a geneticist and applying what you know Mendels pea plants produced both yellow and green peas If yellow is the dominant color for peas and I give you a plant with yellow peas do you automatically know its genotype How can you figure it out Hint geneticists use a cross They use a test cross to see what the offspring phenotype is From this we can tell whether the genotype is Aa or AA
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