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18 Cards in this Set
- Front
- Back
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independent assortment
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the inheritance of the genes for one character are not related to the inheritance of the genes for another character
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principal of segrigation
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offspring can only inherit one set of genes from each parent
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pedigree
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a family tree that shows the inheritance of a particular trait
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incomplete dominance
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in heterozygous it produces an intermediate phenotype
monohybrid crosses should have a phenotypic ratio of 1:2:1 |
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codominance
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in heterozygous both alleles are expressed
monohybrid crosses should have a phenotypic ratio of 1:2:1 |
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ABO blood group alleles
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IA, IB, i (IA and IB are codominant)
A- IA IA / IA i B- IB IB/ IB i AB- IA IB O- ii |
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pleitropy
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one gene affects many phenotypes
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polygenetic character
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a character deturmined by multiple genes
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genes on the same chromosome...
but can be... |
tend to be inherited together
seporated by crossing over |
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linkage group
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genes found on the same chromosome
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explain how independant assortment is affected by linkage groups
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does not apply to genes on the same chromosome (linkage groups would make them inherited together)
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rate of seporation
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crossover rate
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thomas hunt morgan
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genetisist who studied the inheritance patterns of fruit flies. credited with discovering genes are found on chromosomes.
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alleles for sex linked traits
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XR XR, XR Xr, Xr Xr, XR Y, Xr Y
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why is it more difficult for a female to express a sex linked trait?
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the male only needs one of the abnormal genes to express the trait (on the X chromosome) while a female needs two (one for each X)
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what are 2 sex linked traits in humans?
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hemophilia and red-green color blindness
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monohybrid cross
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a cross between 2 parents who are heterozygous OR a term to describe crosses that involve only one character
3:1 |
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dihybrid cross
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crosses that involves 2 characters
9:3:3:1 |
