Transcript Punnett blank - local.brookings.k12.sd.us

MAKING PUNNETT
PREDICTIONS
http://www.exploratorium.edu/exhibits/mutant_flies/mutant_flies.html
IF GENE is AUTOSOMAL and
RECESSIVE TO +
MALES:FEMALES 1:1
F1
___________________
F2
___ = ___
___ = ___
___ = ___
______________
______________
_______
http://www.exploratorium.edu/exhibits/mutant_flies/curly-wings.gif
IF GENE is AUTOSOMAL and
DOMINANT TO +
MALES:FEMALES 1:1
F1
______________________
F2
___ = ___
___ = ___
___ = ___
______________
_______________
______
F1
IF GENE is LETHAL (YY)
(Can’t cross pure dominant)
Males:females 1:1
F1
___ = _________
___ = _________
F2
F2
___ = ___ _______
___ = ___ _______________
___ = ___ ________________
______ ratio
IF GENE is X-linked recessive
Different pattern if gene is inherited from mom or dad
Mutant mom X wild type dad
F1
F1
____________________
____________________
_____________________
_____________________
_____________________
_____________________
When using Virtual fly lab
Choose ignore sex and see if it changes the ratios
IF GENE is X-linked recessive
Different pattern if gene is inherited from mom or dad
Wild type mom X mutant dad
F1
F2
______________________
_______________________
______________________
_______________________
When using Virtual fly lab
Choose ignore sex and see if it changes the ratios
IF GENE is X-linked dominant
MUTANT MOM X WILD TYPE DAD
F1
______________________
________________________
F2
________________________
________________________
________________________
When using Virtual fly lab
Choose ignore sex and see if it changes the ratios
IF GENE is X-linked dominant
WILD TYPE MOM X MUTANT DAD
F1
XM
y
X+ X+XM X+y
X+
X+XM X+y
________________________
________________________
X+
F2
y
X+
X+X+ X+y
XM
X+XM XMy
________________________
________________________
________________________
________________________
When using Virtual fly lab
Choose ignore sex and see if it changes the ratios
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.