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GENETICS POST TEST (Practice Test) 1. When crossing two heterozygous individuals, what is the chance of getting a homozygous individual? a. 0 b. 25% c. 50% d. 75% e. 100% 2. Given parents AABBCc X AabbCc, assume simple dominance and independent assortment. What proportion of the progeny will be expected to phenotypically resemble the first parent? a. ¼ b. 1/8 c. ¾ d. 3/8 e. All 3. Barring in chickens is due to a sex-linked dominant gene (B). The sex of the chicks at hatching is difficult to determine, but barred chicks can easily be distinguished from non-barred chicks. To use this trait so that at hatching all chicks of one sex are differently colored from those of the opposite sex, what cross would you make? a. Barred males X barred females b. Barred males X non-barred females c. Non-barred males X barred females d. Non-barred males X non-barred females e. None of the above would work 4. A 1:0 phenotypic ratio in a testcross indicates that a. The alleles are dominant b. One parent must have been a pure breed c. The dominant phenotype parent was heterozygous d. The alleles segregated independently e. The alleles are co-dominant 5. A couple is consulting with a genetic counselor. Both parents exhibit the normal phenotype for skin pigmentation, but both had one parent who was an albino. Albinism is an autosomal recessive trait. What is the probability that their first child will be albino? a. 1/8 b. c. d. e. ¼ ½ ¾ No chance of the disorder 6. In snapdragons, heterozygotes have pink flowers, whereas, the homozygotes have red or white flowers. When plants with white flowers are crossed with plants with red flowers, what proportion of the offspring will have pink flowers? a. 0 b. 25% c. 50% d. 75% e. 100% 7. A recessive allele on the X chromosome is responsible for red-green color blindness in humans. A woman with normal vision whose father is colorblind marries a colorblind man. What is the probability that this couple’s son will be colorblind? a. 0 b. ¼ c. ½ d. ¾ e. 100% 8. – 10 Refer to the pedigree below. The pedigree indicates color blindness phenotype. Colorblindness is a recessive sex-linked disorder. Genotype choices: A. XX B. XXc C. XcXc D. XY E. XcY 9. Identify the genotype for individual #10 = ______ 10. Identify the genotype for individual #2 = ______ 11. Identify the genotype for individual #5 = ______ QUIZ 1. In mice, coat color is controlled by two genes. The wild type color agouti, is dominant to black coat color, and both are controlled by gene A. A recessive mutation of gene B causes albinism, regardless of the genotype at locus A. The offspring of the two mice have the following ratio: 9/16 agouti, 3/16 black and 4/16 albino What are the genotypes and phenotypes of the parents? What type of gene interaction is occurring? 2. Sue is Gus’ wife. She has blood type A while both of Gus’ parents were homozygous A. Becky has type O blood and her husband Cooper is type B. Cooper’s parents were both type AB. All four were stranded on a desert island for 14 months. Except for Clifford, a nearby Filipino student-teacher/male model with blood type B, there were no visitors to the island. By the end of their stay, both women gave birth to babies. In the confusion of leaving the island, the babies got mixed up. Baby boy #1 was type AB and baby boy #2 was type O. a. Who were the parents of baby boy #1? b. Who were the parents of baby boy #2?