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20 Cards in this Set
- Front
- Back
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-inherited character and determined by factors (now called genes)
-these factors occur in pairs (genes on maternal and paternal homologous chromosomes) -when gametes form, these genes segregate so that only one of the homologous pair is contained in the gamete |
particulate theory
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inherited characters are determined by particular factors
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Law of Segregation
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genes on nonhomologous chromosomes will be distributed randomly into gametes
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Law of Independent Assortment
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heredity unit on a chromosome
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gene
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-gene has alternate states called___
-contributed by parents -____for a particular gene occurs in pairs |
alleles
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alleles that mask the expression of other alleles, but are themselves expressed
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dominant
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alleles whose expression is masked by dominant alleles
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recessive
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physical appearance of a trait
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phenotype
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includes all alleles present in the cell
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genotype
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paired alleles are identical
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homozygous
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pair of different alleles
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heterozygous
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first generation of offspring
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first filial, F1 generation
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heterozygous genotype results in an intermediate phenotype
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incomplete dominance
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inheriting a gene that kills the offspring
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lethal inheritance
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blood type of humans is an example of
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codominance
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blood groups are determined by the presence of compounds called ____ on surfaces of red blood cells
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antigens
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positive and negative characteristic of blood
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Rh factor
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human traits determined by a single gene
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widow's peak
bent little finger albinism pigmented iris attached earlobes hitchhiker's thumb interlacing fingers PTC tasting mid-digital hair dimpled chin six finger |
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diseases determined by a single gene
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cystic fibrosis
galactosemia phenylketonuria (PKU) juvenile retinoblastoma huntington's disease |
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provide a way of inserting foreign DNA into a host cell's chromosome
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transposons
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