11.2 MORE PUNNETT SQUARE PROBLEMS
COMPLETE punnett squares to show the probable outcomes of each situation
HIGHLIGHT the assigned parental phenotypesIDENTIFY the parental genotypes
DETERMINE the probable genotype/phenotypes for the offspring
SIMPLE DOMINANCE
Guinea pigs: B=black fur b=white fur
B BB
b
BB BB
Bb Bb
Black = 100%
GENOTYPESw/RATIOS
PHENOTYPESw/RATIOS
BB 50%Bb 50%
SIMPLE DOMINANCE
EARLOBES: F = free earlobes / f = attached earlobes
F f
F
f
FF Ff
Ff ff
GENOTYPESw/RATIOS
PHENOTYPESw/RATIOS
FF 25%Ff 50%ff 25%
Free 75%Attached 25%
SIMPLE DOMINANCE
ALBINISM: A = no albinism a = albinism
A Aa
a
Aa Aa
Aa Aa
GENOTYPESw/RATIOS
PHENOTYPESw/RATIOS
Aa 100%
No albino
INCOMPLETE DOMINANCE
CARNATIONS: R = red r = white Rr = pink
R Rr
r
Rr Rr
Rr Rr
GENOTYPESw/RATIOS
PHENOTYPESw/RATIOS
Rr 100%
Pink 100%
CO-DOMINANCE
HORSES: R = red r = white Rr = roan
R r
r
r
Rr rr
Rr rr
GENOTYPESw/RATIOS
PHENOTYPESw/RATIOS
Rr 50% rr 50%
Roan 50%White 50%
INCOMPLETE DOMINANCE
HAIR: H = curly hair h = straight hair Hh = wavy hair
H Hh
h
Hh Hh
Hh Hh
GENOTYPESw/RATIOS
PHENOTYPESw/RATIOS
Hh 100%
wavy 100%
SEX LINKED TRAITS
FRUIT FLIES: R = red eyes r = white eyes
Xr yXR
Xr
XRXr
XRy
XrXr Xrywhite eyes = 50%
CIRCLE the offspring that have white eyes.
SEX LINKED TRAITS
HEMOPHILIA: H = normal blood h = hemophilia
XH yXH
Xh
XHXH XHy
XHXh Xhy
males = 50% hemophiliafemales = 50% carriers
CIRCLE the offspring that have hemophilia.
MULTIPLE ALLELES
ABO BLOOD TYPE:
IA i IB
i
IAIB IBi
IAi ii
AB / B / A / OYES—if both parents are heterozygous
PHENOTYPE GENOTYPE
A IAi
B IBi
O ii
MULTIPLE ALLELES
ABO BLOOD TYPE:
IA IB
IB
i
IAIB IBIB
IAi IBi
Pages BakersBaby #1--A Baby #2--O
IA i IB
i
IAIB IBi
IAi ii
