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Cross homozygous dominant tall plant and a heterozygous tall plant. a.What are the Parent genotypes? b.What are the F1 phenotype frequencies? c.What are the F1 genotype frequencies?. Cross homozygous dominant tall plant and a heterozygous tall plant. - PowerPoint PPT Presentation
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Cross homozygous dominant tall plant and a heterozygous tall plant.
a. What are the Parent genotypes?
b. What are the F1 phenotype frequencies?
c. What are the F1 genotype frequencies?
TT
T
t
TT TT
Tt Tt
T = tallT = short
Cross homozygous dominant tall plant and a heterozygous tall plant.
a. What are the Parent genotypes?
b. What are the F1 phenotype frequencies?
c. What are the F1 genotype frequencies?
a. TT and Ttb. All Tallc. 2 TT : 2 Tt
tall tall
tall tall
What gametes can be formed from the following organism?
TtHh
T = straight-tailedt = curly-tailedH = short-hairedh = long-haired
What gametes can be formed from the following Straight-tailed, short-haired dog?
TtHh
Use the foil method:TH Th tH th
What are the genotype and phenotype ratios from crossing
TtHh with TTHH?
TH
TH
TH
TH
TH
Th thtH
T = straight tailedt = curly tailed
H = short hairedh = long haired
F1 Phenotype ratio:
F1 Genotype ratio:
TtHh x TTHH
TH
TH
TH
TH
TH
Th thtH
TTHH TTHh TtHH TtHh
TTHH TTHh TtHH TtHh
TTHH TTHh TtHH TtHh
TTHH TTHh TtHH TtHh
T = straight tailedt = curly tailed
H = short hairedh = long haired
F1 Phenotype ratio:All straight-tailed All short-haired
F1 Genotype ratio:4 TTHH4 TTHh4 TtHH4 TtHh
Straight, short
Straight, short
Straight, short
Straight, short
Straight, short
Straight, short
Straight, short
Straight, short
Straight, short
Straight, short
Straight, short
Straight, short
Straight, short
Straight, short
Straight, short
Straight, short
If cross-pollinating a red snapdragon and white snapdragon produce all pink snapdragons:a. What is the percent chance a
white flower will result from the self pollination of one of the
pink offspring?b. What kind of inheritance is this?
RR
W
W
RW RW
RW RW
R = redW = white
pink pink
pink pink
WR
R
W
RR RW
RW WW
R = redW = white
a. 25% chance two pink-flowered plants produce a white-flowered plant
b. Type of inheritance: incomplete dominance
red pink
pink white
Can a type A mother and type B father have a child with type O blood?
IA = A alleleIB = B allelei = O allele
Genotype possibilities for Type A mom: IAIA or IAi
Genotype possibilities for Type B dad: IBIB or IBi
Can a type A mother and type B father have a child with type O blood?
IA = A alleleIB = B allelei = O allele
Genotype possibilities for Type A mom: IAIA or IAi
Genotype possibilities for Type B dad: IBIB or IBi
iIa
Ib
i
Type AB Type B
Type A Type O
IaIb Ibi
Iai ii
What percent chance does a child have of being colorblind if the mother is normal but a carrier, and the father is normal? What if the father was colorblind?
What is mom’s genotype?
What is dad’s genotype?
What percent chance does a child have of being colorblind if the mother is normal but a carrier, and the father is normal? What if the father was colorblind?
Problem 1: Carrier mother, Normal father
What is mom’s genotype? XBXb
What is dad’s genotype? XBY
What percent chance does a child have of being colorblind if the mother is normal but a carrier, and the father is normal? What if the father was colorblind?
Problem 1: Carrier mother, Normal fatherWhat is mom’s genotype?
XBXb
What is dad’s genotype? XBY
• Daughters: 0%• Sons: 50%
YXB
XB
Xb
XBXB XBY
XBXb XbY
Normal female Normal male
Carrier female Colorblind male
What percent chance does a child have of being colorblind if the mother is normal but a carrier, and the father is normal? What if the father was colorblind?
Problem 2: Carrier mother, Colorblind father
What is mom’s genotype? XBXb
What is dad’s genotype? XbY
What percent chance does a child have of being colorblind if the mother is normal but a carrier, and the father is normal? What if the father was a carrier?
Problem 2: Carrier mother, Colorblind father
What is mom’s genotype? XBXb
What is dad’s genotype?
XbY
• Daughters: 50%• Sons: 50%
YXb
XB
Xb
XBXb XBY
XbXb XbY
Carrier female Normal male
Colorblind female Colorblind male
Feather length in ducks can be short or long. Choose a letter to use for the feather length gene. Determine which allele (short or long) is dominant and which is recessive. Supply the genotypes and phenotypes of the individuals in the pedigree. You will have five individuals where you only know one allele.
Feather length in ducks can be short or long. Choose a letter to use for the feather length gene. Determine which allele (short or long) is dominant and which is recessive. Supply the genotypes and phenotypes of the individuals in the pedigree. You will have five individuals where you only know one allele.
F = shortf = long
ff
ff ff
ff
ff
Feather length in ducks can be short or long. Choose a letter to use for the feather length gene. Determine which allele (short or long) is dominant and which is recessive. Supply the genotypes and phenotypes of the individuals in the pedigree. You will have five individuals where you only know one allele.
F = shortf = long
F_ F_
ff
ff ff
ff
ff
F_ F_
F_
F_
F_F_
F_ F_
F_ F_
F_
F_
F_
Feather length in ducks can be short or long. Choose a letter to use for the feather length gene. Determine which allele (short or long) is dominant and which is recessive. Supply the genotypes and phenotypes of the individuals in the pedigree. You will have five individuals where you only know one allele.
F = shortf = long
Ff Ff
ff
ff ff
ff
ff
Ff Ff
Ff
Ff
FfFf
Ff Ff
F_ F_
F_
F_
F_
An unaffected man marries a woman who is a carrier for Duchenne Muscular Dystrophy, which is attributed to an X-linked gene. They have four children, one with Duchenne, one carrier daughter and a daughter and son who are unaffected. The child with Duchenne Muscular Dystrophy dies in childhood. The carrier daughter marries and has three children of her own, two of which are carriers and one of which is unaffected.
a. Draw a pedigree for this family.b. What is the most likely sex of these two carrier children given the fact that they are unaffected by the X-linked gene?
An unaffected man marries a woman who is a carrier for Duchenne Muscular Dystrophy, which is attributed to an X-linked gene. They have four children, one with Duchenne, one carrier daughter and a daughter and son who are unaffected. The child with Duchenne Muscular Dystrophy dies in childhood. The carrier daughter marries and has three children of her own, two of which are carriers and one of which is unaffected.
a. Draw a pedigree for this family.b. What is the most likely sex of these two carrier children given the fact
that they are unaffected by the X-linked gene?
-For a sex-linked recessive disorder, only females can be carriers.
XDXdXDY
XDY XDYXDXD
XDXd XDXDXDXd
XDXd
XdY or XDXD
Male
Normal none44 2
Male
Abnormal XXY44 3
Female
Normal Trisomy 2145 2
Male
Abnormal Trisomy 1845 2
Male
Abormal
45 2
Trisomy 13
