Transcript Jeopardy - Mahtomedi Middle School

Jeopardy
3.1-3.3 GeneticsReview
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Punnett
Dominant Homozygous
Probability
Recessive Heterozygous Squares
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Misc
What is the difference between incomplete
dominance and codominance?
Incomplete dominance is a
blend of the traits
Codominance is where both
traits show up in the
phenotype
An allele whose trait always shows up in
an organism is a --------- allele.
How is that represented?
A dominant allele
always shows up.
Represented by a capital
letter
Height is controlled by
polygenic inheritance. What
does this mean?
Height is controlled by
many genes
An allele whose trait does not
always show up in an
organism is a
allele.
How is this allele
represented?
A recessive allele does
not always show up in
an organism.
It’s represented by a
capital letter
Black feathered chickens are
codominant to white feathered
chickens. What is the phenotype
of the following…
FBFB
W
W
F F
FBFW
FBFB = black feathers
W
W
F F = white feathers
B
W
F F = black and white feathers
Describe homozygous
using the word allele.
A homozygous organism
has two alleles that are
either both dominant or
both recessive.
Describe heterozygous
using the word allele.
An organism that
has one dominant
and one recessive
allele is
heterozygous.
Is the following homozygous or
heterozygous? Dominant or
recessive?
TT
Homozygous dominant
Perry the Platypus met Pinky the Platypus at the park. Perry is
homozygous for his teal-green color. Pinky is heterozygous for her
pink color. What are the genotypes of the parents?
What is the probability of their children being pink?
What is the probability of their children being teal green?
What is the probability of their children being homozygous dominant?
What is the probability of their children being homozygous recessive?
What is the probability of their children being heterozygous?
Pink – 50%
Teal green – 50%
Homozygous dominant – 0%
Homozygous recessive – 50%
Heterozygous – 50%
How would you write the
genotype for a heterozygous
tall plant?
Tt
Complete the following
Punnett Square.
T
t
t
t
T t
t Tt tt
t Tt tt
w
w
3
W
W
What is the possibility of homozygous
offspring?
0%
w w
W Ww Ww
W Ww Ww
Cross a homozygous recessive
short pea plant with a heterozygous
tall pea plant? What is the probability
of having pea plants with short
phenotypes?
t
T Tt
t tt
t
Tt
tt
50%
Cross a heterozygous tall plant with a
homozygous tall plant. What is the
probability of getting homozygous
dominant offspring?
T
t
T TT Tt
T TT Tt
50%
Mrs. Lindahl has a widow’s peak, a
dominant trait. Neither of her daughters
have a widow’s peak. Does Mrs. Lindahl
have a homozygous or heterozygous
genotype for this trait?
? w
W W? Ww
w ?w ww
Mrs. Lindahl
has to be Ww
Mrs. Lindahl’s
daughter’s genotypes
If a snapdragon’s inheritance pattern is
incomplete dominant, what is the
probability that a white flower and a red
flower will produce a red flower?
W
W
R RW RW
R RW RW
0% chance of a red flowers
In pea plants, purple flowers are
dominant to white. What is the
probability that a heterozygous purple
flower and a homozygous white
flower will produce a white flower?
P
p Pp
p Pp
p
pp
pp
50% chance of a white
flower
What is the probability that a
heterozygous tall flower and a
homozygous tall flower will
produce a short flower? Make a
Punnett Square first.
T t
T TT Tt
T TT Tt
0% chance of a short flower.
What is the probability that someone
whose blood type is heterozygous A
and someone who is blood type AB
will have a baby who has blood type
B?
A
I
i
IA IAIA IAi
IB IAIB IBi
25% chance
What would the parents need
to be produce all babies with
type O blood.
i
i ii
i ii
i
ii
ii
Both parents would need to be
homozygous recessive or ii
(blood type O)
What does genotype mean?
The allele
combination Example: TT, Tt, tt
What does phenotype mean?
Phenotype is the physical
description of the organism.
Example: tall, short, etc.
What can you use to determine the
probability of a genotype occurring?
A Punnett
Square.
What does hybrid mean?
A hybrid is an
organism that has a
dominant and
recessive allele.
What does purebred mean?
A purebred
organism has just
one type of allele.