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19 Cards in this Set
- Front
- Back
Where is DNA found within a cell? |
In the nucleus
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True or false - chromosomes are usually found in groups of 4?
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False - they are found in pairs |
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What is a gene?
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A short length of a chromosome which controls a characteristic e.g hair colour |
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What are alleles?
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Different versions of the same gene
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How many chromosomes are found in a standard human cell?
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23 pairs
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How many chromosomes are found in a sperm or egg cell?
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23 single
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What are the male sex chromosomes?
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XY
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What are the female sex chromosomes?
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XX
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What does homozygous mean?
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You have two alleles the same for a certain gene.
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What does heterozygous mean?
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You have two alleles that are different for a certain gene.
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If you inherited the gene for blue eyes from your mum and brown eyes from your dad, which are you likely to have and why?
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You are more likely to have brown eyes as the brown eye gene is dominant and the blue eye gene is recessive
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Apart from you genes what else affects the way you are?
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The environment (diet, upbringing etc)
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What is a clone?
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Genetically identical organisms
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Is the gene for cystic fibrosis dominant or recessive?
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recessive
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Is the gene for Huntingtons disorder dominant or recessive?
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dominant
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What are the symptoms of Huntintons disorder?
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Shaking, erratic body movements and mental deterioration
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What are stem cells?
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Stem cells are cells that can change their role to beome any type of cell
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Why are stem cells useful?
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They could be used to cure many diseases and injuries
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Why are people against using stem cells?
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They are taken from embryos and some people feel that it is not right to terminate the life of an unborn child
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