A heterozygous mother is crossed with a homozygous Set up the cross: recessive father. ____________X____________ AA = normal thumb Aa = normal thumb aa = hitch-hiker’s thumb A homozygous dominant mother is crossed with a Set up the cross: homozygous recessive father. ____________X____________ AA = normal thumb Aa = normal thumb aa = hitch-hiker’s thumb Two parents with hitch-hikers thumbs are crossed. Set up the cross: AA = normal thumb ____________X____________ Aa = normal thumb aa = hitch-hiker’s thumb Two carriers are crossed. Set up the cross: AA = normal thumb ____________X____________ Aa = normal thumb aa = hitch-hiker’s thumb There are no carriers for Huntington’s Disease. What type of disorder is it (dominant or recessive)? ______________________ The pedigree to the left shows the inheritance of a straight hairline in a family. Is it dominant or recessive? _______________________ What is the sex of the individual? _______________ What disorder do they have? ________________ What causes this disorder? Crossing over Nondisjunction Independent assortment Mitosis
A heterozygous mother is crossed with a homozygous recessive father. AA = normal thumb Aa = normal thumb aa = hitch-hiker’s thumb Set up the cross: ____________X____________ A homozygous dominant mother is crossed with a homozygous recessive father. AA = normal thumb Aa = normal thumb aa = hitch-hiker’s thumb Set up the cross: ____________X____________ Two parents with hitch-hikers thumbs are crossed. AA = normal thumb Aa = normal thumb aa = hitch-hiker’s thumb Set up the cross: ____________X____________ Two carriers are crossed. AA = normal thumb Aa = normal thumb aa = hitch-hiker’s thumb Set up the cross: ____________X____________ There are no carriers for Huntington’s Disease. What type of disorder is it (dominant or recessive)? ______________________ The pedigree to the left shows the inheritance of a straight hairline in a family. Is it dominant or recessive? _______________________ What is the sex of the individual? _______________ What disorder do they have? ________________ What causes this disorder? Crossing over Nondisjunction Independent assortment Mitosis
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