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Genetics
Why we inherit disease
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Created by
Agatha Steed
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Cards (22)
What are inherited disorders?
Conditions passed on through certain
alleles
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What is polydactyly?
Condition with
extra
fingers or toes
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How is polydactyly inherited?
It is caused by a
dominant allele
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What happens if one allele is for polydactyly?
The
disorder
will still be expressed
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What is the genotype of a heterozygous individual with polydactyly?
One
dominant
and one normal
allele
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What is the expected offspring ratio when crossing a heterozygous individual with a homozygous normal individual for polydactyly?
1:1
ratio of polydactyly to normal
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What is cystic fibrosis caused by?
A
recessive allele
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What is the main effect of cystic fibrosis?
Thick sticky
mucus
in the body
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What allele represents cystic fibrosis?
Lowercase
f
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How many recessive alleles are needed to have cystic fibrosis?
Two
recessive alleles
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What is the genotype of most people regarding cystic fibrosis?
Homozygous dominant
genotype
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What do we call individuals who carry one copy of the cystic fibrosis allele?
Carriers
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What is the offspring ratio when crossing two carriers for cystic fibrosis?
3
normal:
1
cystic fibrosis
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What is embryo screening?
Checking embryos for
genetic disorders
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What happens if a genetic disorder is found during embryo screening?
Parents
may discard that embryo
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What are the advantages of embryonic screening?
Reduces overall suffering from health problems
Saves money on treating
genetic
disorders
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What are the concerns regarding embryonic screening?
Implies
genetic
problems are less
desirable
Potential future screening for
non-health
traits
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What is the current legal status of screening for non-health traits in the UK?
There are
laws
preventing this practice
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What is the main purpose of the video discussed?
To explain
inherited disorders
and
screening
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What should viewers do if they enjoyed the video?
Like and subscribe
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