Transcript LR - Denton ISD

Trait
Body Shape
Body Color
Eye Shape
Nose Style
Dominant Gene
Squarepants (S)
Yellow (Y)
Round (R)
Long (L)
Recessive Gene
Roundpants (s)
Blue (y)
Oval (r)
Stubby (l)
What would be a sponge’s phenotype if it had each of
the following pair of alleles:
LL
yy
Ss
Rr
ss
RR
Yy
ll
Trait
Body Shape
Body Color
Eye Shape
Nose Style
Dominant Gene
Squarepants (S)
Yellow (Y)
Round (R)
Long (L)
What would be the genotype(s)
for these traits:
•Yellow body
•Round pants
•Long nose
•Oval eyes
Recessive Gene
Roundpants (s)
Blue (y)
Oval (r)
Stubby (l)
Oh goodie! I
love this
science stuff!
Trait
Body Shape
Body Color
Eye Shape
Nose Style
Dominant Gene
Squarepants (S)
Yellow (Y)
Round (R)
Long (L)
Recessive Gene
Roundpants (s)
Blue (y)
Oval (r)
Stubby (l)
What would the genotype be for each of these traits:
•Heterozygous Round Eyes
•Homozygous Long Nose
•Homozygous Squarepants
Once upon a time, one of SpongeBob’s cousins, SpongeBillyBob, fell in
love with a cute squarepants girl named SpongeSally. After dating for a
few years (and graduating from Bikini Bottom University), they got married.
Let’s use our understanding of genetics to predict their future.
Trait
Body Shape
Dominant Gene
Squarepants (S)
Recessive Gene
Roundpants (s)
For starters:
If SpongeSally’s father is heterozygous squarepants, and her mother
is a roundpants, what is her genotype?
(We know her phenotype is squarepants)
Mother’s Alleles
Father’s Alleles
S
s
s
Ss
ss
s
Ss
ss
Trait
Body Shape
Dominant Gene
Squarepants (S)
Recessive Gene
Roundpants (s)
So we now know that SpongeSally is heterozygous squarepants, and
if SpongeBillyBob is also, what would be the possible genotypes
and phenotypes if they had children?
Sally’s Alleles
BillyBob’s Alleles
S
s
S
SS
Ss
s
Ss
ss
What is the probability of kids with squarepants? Roundpants?
Trait
Eye Shape
Dominant Gene
Round (R)
Recessive Gene
Oval (r)
SpongeBob’s aunt and uncle, SpongeWilma & SpongeWilbur have the
biggest round eyes in the family. Wilma is believed to be heterozygous
for her eye shape, and Wilbur’s family brags that they are a “pure” line
for round eyes. Complete a Punnett square to show the possibilities
that would result if Wilma and Wilbur had children.
Wilma’s Alleles
Wilbur’s Alleles
R
R
R
RR
RR
r
Rr
Rr
Would any of their children have oval eyes? Might their grandchildren?
Trait
Nose Style
Dominant Gene
Long (L)
Recessive Gene
Stubby (l)
SpongeBob’s aunt is famous around town for her itty, bitty stubby nose! She
recently met a handsome squarepants fellow who also has a stubby nose.
Would it be possible for them to have a child with a long nose? Create a
Punnett square to defend your answer.
I don’t even
have a nose!
l
l
l
ll
ll
l
ll
ll
Trait
Nose Style
Dominant Gene
Long (L)
Recessive Gene
Stubby (l)
If SpongeBob’s aunt with the stubby nose wanted children with long
noses, what type of fellow would she need to marry in order to for that
to happen? What would give her the best chances?
Use this
guy again…
Trait
Nose Style
Eye Shape
Dominant Gene
Long (L)
Round (R)
Recessive Gene
Stubby (l)
Oval (r)
If a heterozygous nose and eye sponge crosses with another
heterozygous sponge, what would be the probable offspring traits?
LlRr
Long/Round –
Long/Oval –
Stubby/Round –
Stubby/Oval –
LlRr
LR
Lr
lR
lr
LR
LLRR
LLRr
LlRR
LlRr
Lr
LLRr
LLrr
LlRr
Llrr
lR
LlRR
LlRr
llRR
llRr
lr
LlRr
Llrr
llRr
llrr
Trait
Nose Style
Eye Shape
Dominant Gene
Long (L)
Round (R)
If a heterozygous nose and eye sponge
crosses with another heterozygous sponge,
what would be the probable offspring
traits?
Long/Round –
Long/Oval –
Stubby/Round –
Stubby/Oval –
Recessive Gene
Stubby (l)
Oval (r)
L
l
L
LL
Ll
l
Ll
ll
R
r
R
RR
Rr
r
Rr
rr