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biology paper 2
inheritance
polydactyly
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Cards (13)
What is a characteristic of polydactyly II?
Extra
fingers or toes
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What type of allele causes polydactyly II?
Dominant
allele
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Can a person be a carrier of the polydactyly allele?
No
,
you cannot be a carrier
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What are the genotypes of a heterozygous man and a homozygous normal woman in a cross?
Man:
heterozygous
, Woman:
homozygous
normal
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What is the expected ratio of offspring in the cross between a heterozygous man and a homozygous normal woman?
1:1
polydactyly
to
unaffected
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What does it mean that the offspring percentages are probabilities?
All offspring could have either
trait
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What is embryo screening used for?
To test for
inherited disorder alleles
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What happens to embryos that have defective alleles?
They are not
implanted
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What is a major ethical concern regarding embryo screening?
Destruction of
healthy
embryos
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What is a potential future use of embryo screening?
To produce offspring with
desirable features
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What is gene therapy?
Correcting
faulty alleles
to treat
disorders
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Is gene therapy currently widely used?
No, it is still
experimental
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What are the issues surrounding embryo screening?
Expensive
process
Ethical concerns about embryo destruction
Potential for selecting
desirable
traits
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