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##### Rio Salado BIO101 lab 7

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Question;Bio lab 7;1;What is an allele? (2;points)--Answer below;2. Give an;example of a genetic trait and two alleles for the gene that determine the;trait (3 points);3 Compare and contrast the terms phenotype and genotype. (4;points)--Answer below;4 List the allele combinations (gamete possibilities) that can be;formed by an individual with the following genotype: AABB (2 points)a.--Answer;below;5 List the different allele combinations (gamete possibilities) that;can be formed by an individual with the following genotype: AaBb. (4 points)a.b.c.d.--Answer below;6 Given: P = purple flowers and p = white flowers and P is dominant;over p. a. What is the phenotypic ratio of offspring from a cross between Pp x;pp? (2 points)b. In a population with 160 individuals how many will be;homozygous? (2 points)c. In that same population, how many will be purple? (2;points)--Answer below;7. Which of Mendel?s laws is illustrated in a dihybrid cross? (2 points);b. What does this law state? (3 points)--Answer below;8. Complete the;Punnett square referenced above for the dihybrid cross by entering the genotypes;below. (8 points;9. What are the;genotypic and phenotypic ratios for color and seed cover for a dihybrid cross;between RrSS x Rrss? (4 points)a.;genotypic ratiob. phenotypic;ratio--Answer below;10. What is the;probability of this cross resulting in a plant that is red with wrinkled seed;covers? (2 points)--Answer below;11. In a population of 100, how many will have;smooth seed covers? (2 points)--Answer below;12. The student;has a purple plant and a white plant. The student knows that purple is dominant;over white. When they are bred, all of the resulting offspring are purple. What;is the most likely genotype of the purple plant? (3 points)--Answer below;13. The student;runs a test cross with the purple plant in Question 12. The phenotypic;frequencies of the resulting offspring are 50% white and 50% purple. What is;the true genotype of the purple plant? (3 points)--Answer below;14. Using Mendel's laws, explain why 0% of;the offspring from a cross between a homozygous purple pea plant (e.g. PP) and;a homozygous white pea plant (e.g. pp) are white, while 25% of the offspring;from a cross between two heterozygous purple pea plants (e.g. Pp x Pp) are;white. (5 points)--Answer below;15. Compare the;ratios calculated in Exercises 5 and 6 (coin toss activity) to Mendel?s ratios.;Were they close? Pose a possible explanation for why the ratios may not be;exactly the same. (5 points)--Answer below;16. The;student?s father is very tall. The;student?s mother is very short. The;student?s height is somewhere in between.;Is this codominance or incomplete dominance? Justify your answer. (5 points)--Answer;below;17. If a person;were to have 14 children in a row, all female, what is the probability the next;child would be a female? (2 points)--Answer below;18. In the sickle cell activity, what;happened to the percentage of surviving alleles that were HbA and the;percentage of surviving alleles that were HbS over the course of the;experiment? Why did this happen? (5 points)--Answer below;19. Will these percentages continue to;change as they did in the first few generations? Why or why not? (5;points)--Answer below;20. Explain the impact of malaria of the;HbS allele in Africa vs. the United States. (5 points)--Answer below;21. (Application) How might the information;gained from this lab pertaining to genetics be useful to the student or how can;the student apply this knowledge to everyday life as a non-scientist? (20;points)--Answer below:.

Paper#63076 | Written in 18-Jul-2015

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