Wake-up 1.

Dihybrid Crosses

Dihybrid Cross Punnett square that examines the inheritance of two traits.

Law of Segregation Allele pairs separate during gamete formation

Law of Independent Assortment Allele pairs will separate independently of each other during meiosis It is RANDOM!!!!

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

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

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

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?