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3-1 Mendel’s Work Review Questions Refer to page 76-82 for this section. Use the picture above to answer the following questions in complete sentences: 1. What trait in pea plants is being studied in the cross above? ______________________________________ ________________________________________________________________________________________ 2. What are the two alleles of this trait? ________________________________________________________ ________________________________________________________________________________________ 3. Which allele is the dominant allele? Explain how you know. ______________________________________ ________________________________________________________________________________________ 4. Which allele is the recessive allele? Explain. ___________________________________________________ ________________________________________________________________________________________ 5. What alleles do the F1 offspring have? Explain which allele was inherited from which parent. ___________ ________________________________________________________________________________________ 3-2 Probability and Heredity Notes and Questions Principals of Probability 6. Probability is a number that _____________________________________________________________ ____________________________________________________________________________________ 7. What is the probability of a coin toss to land on heads? ________________________________________ 8. Does the probability predict what will definitely occur? ________________________________________ EXPLAIN _____________________________________________________________________________ 9. What does probability predict is likely to occur if you toss a coin ten times? ________________________ Probability and Genetics 10. A Punnett square is a chart that______________________ __________________________ ________________________ 11. In a genetic cross, the allele that each parent will pass on to its offspring is based on ___________________. 12. Refer to the diagram on pages 86-87 to show how to make a Punnett Square. Remember R represents the dominate round allele and r represents the recessive wrinkled allele. Fill in the captions to the right! 1 2 4 5 3 13. Based on the completed Punnett Square on the previous page, what is the probability that an offspring will be: a. RR _________% These RR plants will look _____________________. (round or wrinkled?) b. Rr _________% These Rr plants will look _____________________. (round or wrinkled?) c. rr _________% These rr plants will look _____________________. (round or wrinkled?) Phenotypes and Genotypes 14. A organism’s phenotype is its ____________________________________________________________ . 15. An organism’s genotype is its ____________________________________________________________ . 16. For each of the genotypes below determine what phenotype would be possible. a. Purple flowers are dominate to white b. Brown eyes are dominate to blue flowers eyes PP _____________________ BB _____________________ Pp_____________________ Bb _____________________ pp_____________________ bb _____________________ 17. For each phenotype below, list the genotypes (remember to use the letter of the dominant trait) Straight hair is dominant to curly. Pointed heads are dominant to round heads. _____ straight _____ curly ____ pointed ____ round 18. An organism that has two identical alleles for a trait is said to be ________________________________ . 19. An organism that has two different alleles for a trait is said to be ________________________________ . 19. For each genotype below, indicate whether it is heterozygous (He) or homozygous (Ho) AA _____ Ee ____ Ii _____ Mm _____ Bb _____ ff ____ Jj _____ nn _____ Cc _____ Gg ____ kk _____ oo _____ 20. In codominance, _______________________________________________________________________ _______________________________________________________________________________________ As a result, ______________________________________________________________________________ . Understanding Main Ideas of 3-2 Complete the two Punnett squares below, and then answer the questions below.. 21. In the cross between two black guinea pigs shown in Punnett Square A, what is the probability that an offspring will be black? __________________________________White? ________________________________________ 22. Is it possible that the cross between two black guinea pigs in Punnett Square A would not produce a white guinea pig?________ Explain. ___________________________________________________________________ 23. What color are the guinea pig parents in the cross shown in Punnett Square B?_________________________ 24. Calculate the probability that an offspring will be black in the cross in Punnett Square B. _________________ ___________________________________________________________________________________________ What is the probability that an offspring will be white? _______________________________________________ ___________________________________________________________________________________________
