B1 You and your genes

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What is a gene?
A section of DNA
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Where are chromosomes located?
The nucleus
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How many pairs of chromosomes are in each cell?
23 pairs
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How chromosomes are in a sex cell?
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What is the difference between homozygous alleles and hetreosygous alleles?
HOMOzygous means the are the same alleles where as HETREOzygous means they are different alleles.
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What happens if you have a dominate allele?
It will always show
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What is the other type of allele?
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Genotype is
alleles you inherit
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Phenotype is
physical characteristics
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Give an example of a genetic characteristic
Eye colour, natural hair colour
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Is weight a genetic characteristic, an enviromental characteristic or both
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True of false: A tattoo is an enviromental characteristic
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Define clone
An organism tart is genetically identical to another organism
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Are twins clones?
only if they are idential twins
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How can plants be clones?
by taking cuttings or making side shoots
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What is a stem cells?
An unspecialised cell
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Where are embryonic stem cells found?
Early embyros
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What happens after the cells are taken?
The embryo is destroyed
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What do some people object stem cell treatment?
They say it is unethical to takes cells from embryos and is 'against God'
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What stem cell is taken from an adult animal?
An adult stem cell
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True or False: Adult stem cells can turn into any type of cell
False they can only turn into some
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Which type of stem cell are use to treat sickle cell anemia?
Adult stem cells
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How can embryonic stem cells be used to treat diabetes?
Thy can be turned into insulin producing cells
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Is the alelle for cystic fibrosis recessive?
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Give two examples of symptoms of cystic fibrosis
Excess sticky mucus, breathing problem
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True or false: the allele for Huntington's disease is recessive
False it is dominant
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One parent has Huntington disease but the other has no allele of Huntington disease, what is the chance their child will have it? (draw a punnet square to help)
50% chance of their child getting it
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True or false: symptoms of Huntington disease are very tired and quickly get out of breath
False, symptoms of Huntington disease tremors, clumsiness and memory loss
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What gene determines if your sex?
The SRY (Sex-determining Region of the Y chromosome)
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What does the SRY tell your body to make?
Androgen hormone
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Name two ways to get a prenatal diagnosis
Amniotic testing and Chronic Villus testing
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How do they do amniotic testing?
They extract amniotic fluid from the womb
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How do they Chronic Villus testing?
They use a suction tube to remove cells from the placenta
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Why are some people against prenatal diagnosis?
It is against God and people could use it to create 'designer' babies
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What are some of the dangers of prenatal diagnosis?
You have a small chance of a miscarriage, not a 100% reliable (could have false negatives and false positives)
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What is PGD?
Pre-implementation Genetic Diagonis
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How do they do?
They use a IVF to fertalise and egg, when it has at least 8 cells they take a cell to test it
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Explain the process of Animal Cloning
1) An nucleus is taken from an egg cell 2)The nucleus from an adult body cell 3)Body cell is put into the egg cell 4)It is electrocuted to get it do reproduce 5)The cell grows to create a clone to the body cell doner
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Other cards in this set

Card 2


Where are chromosomes located?


The nucleus

Card 3


How many pairs of chromosomes are in each cell?


Preview of the front of card 3

Card 4


How chromosomes are in a sex cell?


Preview of the front of card 4

Card 5


What is the difference between homozygous alleles and hetreosygous alleles?


Preview of the front of card 5
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really good, They helped me with my revison

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