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B250WT2S05 - M.CO 411 MED PR E BIL 250/P Genetics Form 1 OM...

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Exam 2 BIL 250/P “Genetics” 3/24/05 Form 1 *: The underlined choice is the correct answer. Use the following information for questions 1-2. A diploid somatic cell from a rat has a total of 42 chromosomes (2n = 42). As in humans, sex chromosomes determine sex: XX in females and XY in males. 1. What is the total number of chromosomes present in the cell during metaphase I of meiosis? a. 21 b. 42 c. 84 d. 126 e. 168 2. What is the total number of chromosomes in a polar body cell from a rat? 3. The figure shows a chromosomal separation taking place. The letters stand for genes; capital and lowercase stand for different alleles. 2n in this organism is 4. What process is shown? a. anaphase of mitosis b. telophase of meiosis I c. anaphase of meiosis I d. telophase of mitosis e. anaphase of meiosis II A A b B C d C d PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.CO M
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4. While doing field work in Madagascar, you discover a new dragonfly species that has either red (R) or clear (r) wings. Initial crosses indicate that R is dominant to r. You perform two crosses using two different sets of red-winged parents with unknown genotype and observe the following data: Cross Phenotypes 1 72 red-winged, 24 clear-winged 2 96 red-winged What is the most likely genotype for each pair of parents in the two crosses? 5. Codominant alleles are expressed in individuals that are _____________. 6. In mammals, the inability to make the pigment melanin results in albinism, a recessive somatic condition. Two normal parents, who have decided to have three children, have a first child that is albino (genotype aa). Determine the following probability that the second and third children are normal. a. 1/16 b. _ c. 1/8 d. _ e. 9/16 7. Red-green color blindness is X-linked recessive. A woman with normal color vision has a father who is color-blind. The woman has a child with a man with normal color vision. Which phenotype is NOT expected? a. color-blind female b. color-blind male c. noncolor-blind female d. noncolor-blind male PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.CO M
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Use the pedigree for the following three questions.
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