Genetic Disorders

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  • Created by: Nicole D
  • Created on: 07-12-13 19:44
Genetic Disorders
22 Questions
1 of 23
What are mutations?
Changes in the base sequences of our genes
2 of 23
What are genetic disorders?
Diseases that can be inherited
3 of 23
What is the result of polydactyly?
Having extra fingers and toes
4 of 23
It is caused by a __________ allele
Dominant
5 of 23
How many parents need to have the disorder for it to be passed on?
One
6 of 23
What is cystic fibrosis?
A disorder of the cell membranes
7 of 23
What is a sufferer of cystic fibrosis unable to do?
Transport certain substances from one side to another
8 of 23
Mucus secretions become very___(1)___ and ____(2)____
(1) thick ; (2) sticky
9 of 23
What happens to the organs of a cystic fibrosis sufferer?
They become clogged up which stop them working properly
10 of 23
Where are symptoms particularly evident?
In lungs, pancreas and reproductive system
11 of 23
Caused by a ___________ allele
Recessive
12 of 23
How can parents who do not suffer cystic fibrosis give birth to a child who does suffer?
If both parents are heterozygous because this means that they are carriers but not a sufferer
13 of 23
Sickle-cell anaemia is caused by a __________ allele
Recessive
14 of 23
How does Sickle-cell anaemia affect someone?
Affects red blood cells so they are less able to carry oxygen
15 of 23
Possible symptoms of Sickle-cell anaemia?
Breathlessness, lethargy, joint pain and tissue death
16 of 23
Common in ___________ zones
Malarial
17 of 23
What is an advantage of being a carrier of sickle-cell anaemia?
Makes you more likely to survive in high malaria prevalence areas
18 of 23
If someone has Down's Syndrome they have an extra ____________
Chromosome
19 of 23
Another name for this is ___________
Trisomy
20 of 23
Therefore how many chromosomes does the sufferer have in total?
47
21 of 23
Within the 23 pairs of chromosomes, at which pair is the extra chromosome?
The 21st pair
22 of 23
How does the inheritance of Down's Syndrome differ from other genetic disorders?
(1) not just the inheritance of one allele so can't call it hetero- or ****- zygous ; (2) parents aren't necessarily carriers
23 of 23

Other cards in this set

Card 2

Front

What are mutations?

Back

Changes in the base sequences of our genes

Card 3

Front

What are genetic disorders?

Back

Preview of the front of card 3

Card 4

Front

What is the result of polydactyly?

Back

Preview of the front of card 4

Card 5

Front

It is caused by a __________ allele

Back

Preview of the front of card 5
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