PracticeQuestions - Practice Questions for Mendelian...

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Practice Questions for Mendelian Genetics 1. What is the genotype of a dominant individual if some of its offspring show the recessive phenotype? 2. Classical albinism results from a recessive allele. Which of the following is the expected offspring from a normally pigmented male (who has an albino father) and an albino wife? a. 75% normal; 25% albino b. 75% albino; 25% normal c. 50% normal; 50% albino d. all normal e. all albino Consider the following sex-linked charctersitics. In fruit flies, dominant allele "R" produces red eyes and recessive allele "r" produces white eyes. Note : the R and r alleles are sex-linked. Pick the correct mating described by the following questions and bubble in the letter on scantron. a. X R X r X X R Y b. X R X R X X r Y c. X r X r X X R Y d. X R X r X X r Y e. X r X r X X r Y 3. All the male offspring will have white eyes, and all the female offspring will have red eyes. ___________ 4. All the female offspring will have red eyes, but half the male offspring will have red eyes and half will have white eyes. ___________ 5. Why would Mendelian Genetics predict that half of the human babies conceived would be males and half will be females [think about this carefully]? 6. A type of muscular dystrophy is sex-linked. Affected persons usually die by the age of 15-20. Suppose that a boy with the disease lives long enough to marry a woman heterozygous for the trait. If they have a son, what is the probability that he will have the disease? (a) 25%; (b) 50%; (c) 75%; (d) 100%; (e) 0% 7. Why are traits controlled by sex-linked recessive genes are expressed more often in males? 8. If you have the following genotype Bb, the B represents the? (a) dominant allele; (b) co-dominant allele; (c) recessive allele; (d) homozygous allele; (e) all of the above 1
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9. A colorblind boy has a non-colorblind mother and a colorblind father. From which parent did he get the colorblind gene? a. father b. mother c. either parent could have given him the gene d. none of the above choices are correct e. not enough information is provided 10. Punnett Squares are used to: a. determine possible Genotypes produced b. determine the probable expression of genetic diseases c. determine possible phenotypes produced d. all of the above 11. In poultry, there are two independently assorting gene loci, each with two alleles that
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PracticeQuestions - Practice Questions for Mendelian...

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