black mouse is mated with a pure breeding brown mouse, the offspring will not be intermediate in colour i.e. dark brown or some combination of brown and black; but will be all black
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Example of Back cross/test cross
discover the genotype of a black mouse (BB/ Bb), it is mated with a homozygous recessive brown mouse (bb); mouse is homozygous (BB) all the offspring are black (Bb); mouse is heterozygous (Bb), half the offspring are black or brownnd half are
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example of continuous variation
a person may inherit an allele for the gene controlling height related to tallness (HMGA2) but height will also be controlled by food – still be short if undernourished during growth
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Why do mens get more diseases than women
X chromosome only; This means there is no ‘built in redundancy’
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WHat are the disease than men get
haemophilia and red green colour blindness
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Independent inheritance of two different genes
Genes are found on different chromosomes and therefore are inherited independently
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Example of independent inheritance
mendels experiment
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Why so many different gametes in the F2 independent inheritance
Law of Independent Assortment* – separate genes and alleles are assorted into individual gametes separately from each other
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F2 generation - Phenotype medals result
Ratio 9:3:3:1; Mendel’s results 315: 106: 101: 32
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when does Simultaneous inheritance of more than one allele occur
This occurs when genes for 2 or more characteristics are located on the same pair of chromosomes; Hence these genes are inherited together - a phenomenon called linkage
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example of Simultaneous inheritance of more than one allele
some individuals of the fruit fly Drosophila have vestigial wings and narrow abdomens compared to the normal fruit flies
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Other cards in this set
Card 2
Front
Example of Back cross/test cross
Back
discover the genotype of a black mouse (BB/ Bb), it is mated with a homozygous recessive brown mouse (bb); mouse is homozygous (BB) all the offspring are black (Bb); mouse is heterozygous (Bb), half the offspring are black or brownnd half are
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