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Biology
Inheritance, Variation and Evolution B6.T2.P2
Inherited Disorders
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Nicole
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Cards (25)
What type of disorders can be inherited from parents?
Some
genetic disorders
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What can be screened for in embryos?
Many
inherited disorders
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What causes Cystic Fibrosis?
A
recessive allele
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What effect does Cystic Fibrosis have on the body?
It produces thick, sticky
mucus
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Why are individuals with one copy of the recessive allele considered carriers?
They do not show
symptoms
of the disorder
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What must be true for a child to have Cystic Fibrosis?
Both parents must be
carriers
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What happens if either parent has Cystic Fibrosis?
Their
children
will also have the disorder
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What is the probability of a child having Cystic Fibrosis if both parents are carriers?
1 in 4
chance
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What is Polydactyly?
A
genetic
disorder with extra fingers or toes
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What type of allele causes Polydactyly?
A
dominant
allele
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Can Polydactyly be passed on if only one parent carries the allele?
Yes, it can run in the
family
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What is the chance of a child having Polydactyly if one parent has the allele?
50%
chance
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What is the process of in vitro fertilisation (IVF)?
Embryos
are
fertilised
in
a
laboratory
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What can be done to embryos before implantation during IVF?
A
cell
can be removed and analysed
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Which genetic disorder can be detected through embryo screening?
Cystic Fibrosis
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What is a controversial aspect of embryo screening?
Ethical issues
surrounding the process
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What happens to embryos with 'bad' alleles after screening?
They would be destroyed
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What could screening lead to for embryos in the womb?
Decision to
terminate
the pregnancy
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What are the arguments for embryo screening?
Helps families choose healthy embryos
Reduces suffering from
severe disorders
Saves
government healthcare costs
Allows parents to select traits
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What are the arguments against embryo screening?
Ethical concerns about
'playing God'
Potential for
discrimination
based on
traits
Risk of social pressure to screen
Limits
on parental choice
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What is a potential outcome of embryo screening for parents?
Choosing a
healthy
embryo
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What is a concern regarding the cost of treating disorders?
It costs the
Government
a lot of money
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What is a limitation regarding sex selection of babies?
Cannot select unless for
health reasons
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What is a good practice suggested in the material regarding embryo screening?
Writing a balanced
argument
for and against
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What is the question posed at the end of the material?
Why wouldn’t all carriers for the
cystic fibrosis
allele
have the disorder?
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