BIOL 101 1st Edition Lecture 14 Outline of Last Lecture I. Errors in MeiosisII. Inherited Traitsa. Allelesb. DominanceOutline of Current Lecture I. Law of Equal SegregationII. AllelesIII. Single Gene CrossesCurrent LectureI. 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 allelePolygenic inheritance – multiple genes influencing one phenotype APPLY WHAT YOU KNOW! Add alleles to the cell shown below:black oval – AWhite oval – ABlack cylinder – Bwhite cylinder – bblack rectangle – Cwhite rectangle – c II. Single gene crosses: applying Mendel’s Law of Equal segregationUsing 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 parentThinking 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 andI 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. Genotypes of parentscrossedGenotypes of offspringA/A x a/aAaA/a x A/aAA,Aa,aaA/a x A/AAA,AaA/AAa x
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