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Published byMorgan Beverley Berry Modified over 9 years ago
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Wake-up 1.
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Dihybrid Crosses
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Dihybrid Cross Punnett square that examines the inheritance of two traits.
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Law of Segregation Allele pairs separate during gamete formation
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Law of Independent Assortment Allele pairs will separate independently of each other during meiosis It is RANDOM!!!!
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Mendel’s Experiment Mendel decided to cross a purebred plant possessing yellow and smooth seeds with a green, wrinkled plant. What were his results? YYRR x yyrr YRyr Need to find all the possible combinations of allele for each gene from each parent. Set up Punnett Square
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Mendel’s Experiment He then decided to let the offspring of the F1 generation self-pollinate. What were his results? YyRr x YyRr Need to find all the possible combinations of allele for each gene from each parent. YR, Yr, yR, yr Set up Punnett Square
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Example #1 A man with hairy ears and is heterozygous for a unibrow marries a woman that is a carrier for both traits. What is the chance that their children will be normal? Non-hairy ears=H, Hairy ears=h, Unibrow=B, 2 eyebrows=b
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Example #2 If a blue-eyed female is married to a heterozygous brown-eyed male and the female is left-handed as is the male, with brown eyes being dominant over blue eyes and right-handedness dominate over left- handedness, what will the offspring of this couple look like?
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