1 - Crossing Over Gametes BbVv x bbvv Expected F1 BbVv bbvv...

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Crossing Over: Gametes: BbVv x bbvv Expected F1: ½ BbVv & ½ bbvv Actual F1: (out of 2300) 975-normal(BbVv) 944- black vestigal (bbvv) 206-other recombinants 185-other recombinants Why aren’t all the offspring parental types? Meiosis crossing over More space in between=more space of crossing over Recombination frequency=391 total recombinant =17% 17 map units apart 2300 total Nondisjuction: Meiosis 1 abnormal: n+1, n+1, n-1,n-1 gametes Meiosis 2 abnormal: n+1, n-1, n, n gametes Complete dominance: normal; heterozygous & homozygous dominant show dominant phenotype Incomplete dominance: heterozygous not complete; ex. White flower + red flower pink flower Epistasis: one gene alters the phenotype of another gene; ex: mouse fur —Bb=black or brown & Cc=pigment or no pigment (if no pigment, NO color shows BBcc) Pleiotropy: one gene is responsible for multiple phenotypes Polygenic: one phenotype is given by multiple alleles; ex. skin color Codominence: both alleles show up fully; ex. blood(AB) DNA replication Helicase -unwinds DNA Binding
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