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10 Cards in this Set
- Front
- Back
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Why is DNA important? |
It contains information that creates the genetic code which in turn is read by an organisms cells and then used to determine a characteristic |
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Why are the genotypic ratios different to the phenotypic ratio? Eg if offspring are DD,Dd,Dd and dd |
There are three different genotypes and two phenotypes. Two of the 3 genotypes express 1 of the phenotypes |
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Why is DNA important in making each organism unique? |
It varies from one species to the next, contains blueprints for every organism and each organism will have unique base parings |
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Why is genetic variation important? |
It enhances/increases the survival rate of a species |
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Independent assortment is: |
When meiosis occurs, the homologous pairs line up and it is completely random as to which of these chromosomes go into which cell |
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Explain how sexual reproduction creates genetic variation (umbrella -brief) |
Back (Definition) |
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How does meiosis result in genetic variation? |
Along with the processes of crossing over and independent assortment, meiosis creates variation in the way that every single gamete produced is unique and any of these can become fused together in fertilisation with another unique gamete |
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How does fertilisation result in genetic variation? |
In the process of fertilisation, gametes (sperm and egg) fuse together which creates a zygote that contains a mixture of the genetic information carried by the parents gametes. |
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How does mate selection result in genetic variation? |
Either a female or male (typically a female) will want to mate with other organisms that have a desirable trait which would be passed onto the offspring |
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Crossing over is: |
In the process of meiosis, homologous chromosomes pairs line up and just before they separate into separate cells, sections of DNA are exchanged with each other |
