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Rio Salado BIO101 lab 7




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)--


Paper#63085 | Written in 18-Jul-2015

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