Genetics Exam 1 Module 2 Exam

QUESTION 1 1. I confirm that I am completing this exam on my own, without consulting outside sources. I also confirm that I am completing the exam completely independently, on my own. I have not discussed the exam or its content with others, and I will not discuss the exam or its content with others until after the exam deadline. Yes, I confirm. No, I do not. 0 points QUESTION 2 1. In pea plants, round seeds (R) are dominant over wrinkled seeds (r). You find a pea plant with round seeds and want to test if it is homozygous or heterozygous for round seeds. What would be the BEST way to find out? Sequence its whole genome Cross it with another plant that has round seeds and see what kinds of offspring you get Try to identify its parents and see whether they had round or wrinkled seeds Cross it with a plant that has wrinkled seeds and see what kinds of offspring you get 2 points QUESTION 3 1. In pea plants, purple flowers (P) are dominant over white flowers (p). You cross two plants that have purple flowers, and you get 100 offspring. 77 of the offspring have purple flowers and 23 of the offspring have white flowers. Which of the following are the MOST likely genotypes of the parents? Pp and pp PP and PP Pp and PP Pp and Pp 2 points QUESTION 4 1. You identify a strain of mice that do not develop tails. You hypothesize that taillessness (loss of tails) is caused by a Mendelian, recessive, X-linked mutation. Which would be the BEST way to test this hypothesis? Cross a tailless female mouse with a normal (tailed) male mouse Cross a tailless male mouse with a normal (tailed) female mouse Cross a tailless male mouse with a tailless female mouse All of these are equally viable options 2 points QUESTION 5 1. In fruit flies, mutations in the autosomal gene vestigial (vg) cause the wings to be tiny and underdeveloped; the two alleles are designated as vg+ (wild-type, normal allele) and vg- (mutant allele). You perform a cross between a fly with vestigial wings and a fly with normal wings from a true-breeding strain, to obtain F1 flies. What are the genotypes of the gametes that can be produced by the F1 flies? vg+/vg- and vg-/vgvg+/vg+ only vg+/vg+, vg+/vg-, and vg-/vgvg+ and vg2 points QUESTION 6 1. In pea plants, inflated pods (C) are dominant over constricted pods (c). You have a true-breeding strain of peas with inflated pods, and a true-breeding strain with constricted pods. You cross a pea plant from the true-breeding inflated strain, with a plant from the true-breeding constricted strain to get an F1 generation. You then cross the F1 plants back to a true-breeding constricted plant. You obtain 100 F2 offspring total. How many offspring with each phenotype do you expect to get? 75 inflated, 25 constricted 25 inflated, 75 constricted 50 inflated, 50 constricted 67 inflated, 33 constricted 2 points QUESTION 7 1. In fruit flies, yellow eyes are caused by a recessive, X-linked mutation (ye-; the wildtype allele is ye+). You cross a male with yellow eyes to a female fly with normal red eyes from a true-breeding strain. Which of the following is the BEST prediction for what types of offspring you will see in the F1 generation? The males will all have red eyes, and the females will all have red eyes The males will all have yellow eyes, and the females will all have yellow eyes The males will all have red eyes, and the females will all have yellow eyes The males will all have yellow eyes, and the females will all have red eyes 2 points QUESTION 8 1. In fruit flies, yellow eyes are caused by a recessive, X-linked mutation (ye-; the wildtype allele is ye+). You cross a female with yellow eyes to a male fly with normal red eyes from a true-breeding strain. Which of the following is the BEST prediction for what types of offspring you will see in the F1 generation? The males will all have yellow eyes, and the females will all have red eyes The males will all have red eyes, and the females will all have yellow eyes The males will all have red eyes, and the females will all have red eyes The males will all have yellow eyes, and the females will all have yellow eyes 2 points QUESTION 9 1. The genes Q and R are unlinked, and each have two alleles (Q and q for the first gene, R and r for the second gene). You cross a QQrr fly with an qqRR fly to obtain an F1 fly. The gamete genotypes that gan be produced by the F1 fly are... QQ and RR Qq and Rr QR, Qr, qR and qr QR and rr