1 / 9

MAKING PUNNETT PREDICTIONS

MAKING PUNNETT PREDICTIONS. http://www.exploratorium.edu/exhibits/mutant_flies/mutant_flies.html. m m + +. IF GENE is AUTOSOMAL and RECESSIVE TO + MALES:FEMALES 1:1. +m +m +m +m. F 1 All = +m (wildtype). + m + m. F 2 ¼ = ++ 75% wildtype

preston-hays
Download Presentation

MAKING PUNNETT PREDICTIONS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. MAKING PUNNETT PREDICTIONS http://www.exploratorium.edu/exhibits/mutant_flies/mutant_flies.html

  2. m m + + IF GENE is AUTOSOMAL and RECESSIVE TO + MALES:FEMALES 1:1 +m +m +m +m F1 All = +m (wildtype) + m + m F2 ¼ = ++ 75% wildtype ½ = +m ¼ = mm 25% mutant 3:1 ++ +m +m mm http://www.exploratorium.edu/exhibits/mutant_flies/curly-wings.gif

  3. IF GENE is AUTOSOMAL and DOMINANT TO + MALES:FEMALES 1:1 M M + + +M +M +M +M F1 All = +M (mutant) + M + M F2 ¼ = ++ 25% wildtype ½ = +M ¼ = MM 75% mutant 1:3 ++ +M +M MM

  4. F1 IF GENE is LETHAL (YY) (Can’t cross pure dominant) Males:females 1:1 Y y y y Yy yy Yy yy F1 50% = Yellow 50% = grey F2 Y y Y y F2 ¼ = YY (lethal) ½ = Yy 2/3 yellow ¼ = yy 1/3 grey 2:1 ratio YY Yy Yy yy X

  5. IF GENE is X-linked recessive Different pattern if gene is inherited from mom or dad Mutant mom X wild type dad F1 Xm y X+ Xm F1 X+ y Xm Xm X+Xm X+y XmXm Xmy X+Xm Xmy X+Xm Xmy 25% normal females25% mutant females 25% mutant males25% normal males 50% normal females 50% mutant males When using Virtual fly labChoose ignore sex and see if it changes the ratios

  6. IF GENE is X-linked recessive Different pattern if gene is inherited from mom or dad Wild type mom X mutant dad F1 X+ y X+ Xm F2 Xm y X+ X+ X+Xm Xmy X+Xm Xmy X+Xm X+y X+Xm X+y 50% normal females 50% normal males 50% normal females 50% mutant males When using Virtual fly labChoose ignore sex and see if it changes the ratios

  7. IF GENE is X-linked dominant MUTANT MOM X WILD TYPE DAD F1 F2 XM y X+ XM X+ y XM XM X+XM X+y XMXM XMy X+XM XMy X+XM XMy 50% mutant females50% mutant males 50% mutant females 25% wild type males25% mutant males When using Virtual fly labChoose ignore sex and see if it changes the ratios

  8. IF GENE is X-linked dominant WILD TYPE MOM X MUTANT DAD F1 X+ y X+ XM F2 XM y X+ X+ X+X+ X+y X+XM XMy X+XM X+y X+XM X+y 50% mutant females 50% normal males 25% wild type females25% mutant females25% wild type males25% mutant males When using Virtual fly labChoose ignore sex and see if it changes the ratios

  9. GENETIC ABBREVIATIONS DOMINANT MUTATIONS: first letter = capitalized. EX: sternopleural bristles= Sp RECESSIVE MUTATIONS = lower case EX: mahogany eyes = mah normal "wild type" version of the gene = same abbreviation as mutant with a "+" superscript For example, Sp+ and mah+. Sometimes, when the meaning is obvious, "+" by itself is used EX: heterozygote genotypes: +/Sp and +/mah. VIRTUAL FLY LAB DOESN’T FOLLOW THIS PROTOCOL:You need to explore and figure out whether it is dominant or recessive.

More Related