what is sex linkage? males have the genotype xy whereas females are xx. create a genetic diagram to...
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What is sex linkage?Males have the genotype XY
whereas females are XX.
Create a genetic diagram to show the possible genotypes
produced.
What are the phenotype ratios.
Objectives Outcomes3: Describe sex linkage and some associated conditions
5: Explain fully how sex linked conditions can be inherited.
7: Evaluate the role of the X and Y chromosomes in the
inheritance of named examples of inherited conditions.
Key terms: sex linkage, haemophilia, colour blindness, inheritances.
What is sex linkage?
Outcomes3: Describe sex linkage and some associated conditions
5: Explain fully how sex linked conditions can be inherited.7: Evaluate
the role of the X and Y
chromosomes in the transfer
of named examples of
inherited conditions.
Key terms: sex linkage, haemophilia, colour blindness, inheritances.
What is sex linkage?
Outcomes3: Describe sex linkage and some associated conditions
5: Explain fully how sex linked conditions can be inherited.7: Evaluate
the role of the X and Y
chromosomes in the transfer
of named examples of
inherited conditions.
Key terms: sex linkage, haemophilia, colour blindness, inheritances.
What is sex linkage?
Sex linkageOutcomes3: Describe sex linkage and some associated conditions
5: Explain fully how sex linked conditions can be inherited.7: Evaluate
the role of the X and Y
chromosomes in the transfer
of named examples of
inherited conditions.
Key terms: sex linkage, haemophilia, colour blindness, inheritances.
Sex linkageOutcomes3: Describe sex linkage and some associated conditions
5: Explain fully how sex linked conditions can be inherited.7: Evaluate
the role of the X and Y
chromosomes in the transfer
of named examples of
inherited conditions.
Key terms: sex linkage, haemophilia, colour blindness, inheritances.
Outcomes3: Describe sex linkage and some associated conditions
5: Explain fully how sex linked conditions can be inherited.7: Evaluate
the role of the X and Y
chromosomes in the transfer
of named examples of
inherited conditions.
Key terms: sex linkage, haemophilia, colour blindness, inheritances.
What is sex linkage?
Outcomes3: Describe sex linkage and some associated conditions
5: Explain fully how sex linked conditions can be inherited.7: Evaluate
the role of the X and Y
chromosomes in the transfer
of named examples of
inherited conditions.
Key terms: sex linkage, haemophilia, colour blindness, inheritances.
What is sex linkage?
Outcomes3: Describe sex linkage and some associated conditions
5: Explain fully how sex linked conditions can be inherited.7: Evaluate
the role of the X and Y
chromosomes in the transfer
of named examples of
inherited conditions.
Key terms: sex linkage, haemophilia, colour blindness, inheritances.
TaskComplete the questions on sex linked
conditions
What is sex linkage?
Outcomes3: Describe sex linkage and some associated conditions
5: Explain fully how sex linked conditions can be inherited.7: Evaluate
the role of the X and Y
chromosomes in the transfer
of named examples of
inherited conditions.
Key terms: sex linkage, haemophilia, colour blindness, inheritances.
What is sex linkage?
Sex-linked genetic crosses• Red-green colourblindness:Let XB = chromosome with the allele for normal visionLet Xb = chromosome with the allele for colour blindness Y = chromosome with no gene for visionParents phenotype Normal mother x Colour blind father
genotype XB XB Xb YGametes
♀\♂ Xb Y
XB XBXb XB Y
XB XBXb XB Y
Offspring genotypes: XBXb XBY
Offspring phenotypes: Female carrier Male normal
• HaemophiliaLet XH = chromosome with the allele for normal blood clottingLet Xh = chromosome with the allele for haemophilia Y = chromosome with no gene for blood clottingParents phenotype Carrier mother x Normal father
genotype XH Xh XH YGametes
♀\♂ XH Y
XH XHXH XH Y
Xh XHXh Xh Y
Offspring genotypes: XHXH XHXh XHY XhY
Offspring phenotypes: Female Female Male Male
normal carrier normal haemophilia
Outcomes3: Describe sex linkage and some associated conditions
5: Explain fully how sex linked conditions can be inherited.7: Evaluate
the role of the X and Y
chromosomes in the transfer
of named examples of
inherited conditions.
Key terms: sex linkage, haemophilia, colour blindness, inheritances.
What is sex linkage?
Outcomes3: Describe sex linkage and some associated conditions
5: Explain fully how sex linked conditions can be inherited.7: Evaluate
the role of the X and Y
chromosomes in the transfer
of named examples of
inherited conditions.
Key terms: sex linkage, haemophilia, colour blindness, inheritances.
What is sex linkage?
Outcomes3: Describe sex linkage and some associated conditions
5: Explain fully how sex linked conditions can be inherited.7: Evaluate
the role of the X and Y
chromosomes in the transfer
of named examples of
inherited conditions.
Key terms: sex linkage, haemophilia, colour blindness, inheritances.
What is sex linkage?
Outcomes3: Describe sex linkage and some associated conditions
5: Explain fully how sex linked conditions can be inherited.7: Evaluate
the role of the X and Y
chromosomes in the transfer
of named examples of
inherited conditions.
Key terms: sex linkage, haemophilia, colour blindness, inheritances.
What is sex linkage?
Outcomes3: Describe sex linkage and some associated conditions
5: Explain fully how sex linked conditions can be inherited.7: Evaluate
the role of the X and Y
chromosomes in the transfer
of named examples of
inherited conditions.
Key terms: sex linkage, haemophilia, colour blindness, inheritances.
What is sex linkage?
Outcomes3: Describe sex linkage and some associated conditions
5: Explain fully how sex linked conditions can be inherited.7: Evaluate
the role of the X and Y
chromosomes in the transfer
of named examples of
inherited conditions.
Key terms: sex linkage, haemophilia, colour blindness, inheritances.
What is sex linkage?
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