Mendel’s Laws

1. Mendel’s Laws The Law of Segregation: The two alleles for a trait separate when gametes form

2. Law of Independent Assortment: the alleles of different genes separate independently of one another during gamete formation

3. Independent Assortment Animation

7. 1. What ratio of offspring is AaBb? _______________ 2. What ratio is aaBb? _______________ 3. What ratio is AABb? ______________

8. A woman with the genotype PpRr is crossed with a man with the genotype PPRr. • What is the phenotype of the mom? _____________________________ • What is the phenotype of the father? ___________________________

9. 3. What ratio of the offspring will be PPRR? ___________________ 4. What ratio of the offspring will have Puffy, red lips? __________ 5. What ratio of the offspring will be heterozygous for both traits? _______________________ 6. Which of the four traits will not show up in any of the offspring? ________________________

10. 1. In pea plants, the round seed allele is dominant over the wrinkled seed allele, and the yellow seed allele is dominant over the green seed allele. R= round, r = wrinkled, Y= yellow, y = greenCross a pea plant that is RrYY with one that is rrYy

11. What ratio of the offspring is: Round and yellow: _____________________ Round and green: _____________________ Wrinkled and yellow: ___________________ Wrinkled and green: ___________________

12. 2. In fruitflies, red eyes (R) are dominant over white eyes. Long wings (L) are dominant over short wings.Show the cross between a male who is Rrll and a female who is rrLl

13. What ratio of offspring have: a) Red eyes, long wings ________ b) Red eyes, short wings ________ c) White eyes, long wings _________ d) White eyes, short wings _________