ch03 - Chapter 3 Mendelian Genetics: How Are Traits...

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Chapter 3 Mendelian Genetics: How Are Traits Inherited? 1. You have physical characteristics (traits) that appear in neither of your parents. This supports the notion that a. Traits can only be passed from grandparents to grandchildren b. Traits are not inheritable c. Traits can persist in populations for many generation d. Traits express themselves only when favorable conditions exist e. Traits are inherited in every generation of offspring Ans: c 2. Which of the following is NOT a reason for Mendel's success in determining inheritance patterns? a. He focused on just a few traits. b. He chose the garden pea as his experimental organism. c. He thoroughly documented all of his results. d. He employed peasant farmers to test his hypotheses e. He was careful to quantify all of his results Ans: e 3. The specialized reproductive cells of an organism are a. sperm b. eggs c. zygotes d. gametes e. a, b, and d Ans: e 4. The difference between self-fertilization and cross-fertilization is: 24
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Chapter 3 a. Self-fertilization involves pollen and eggs from the same plant while cross-fertilization involves pollen and eggs from two different plants. b. Self-fertilization involves pollen from one variety to fertilize eggs from another variety while cross-fertilization involves pollen and eggs from the same varieties c. Self-fertilization requires the assistance of a pollinator (wind, insects, scientists) while cross- fertilization does not need a pollinator d. Self-fertilization creates hybrid offspring while cross-pollination creates dihybrid offspring e. None of the above is accurate Ans. a 5. The F 2 or second filial generation result from a. Self-fertilization of organisms from the F 1 or first filial generation b. Cross-fertilization of organisms from two different species c. Cross-fertilization of organisms from generation one and generation two d. Artificial-fertilization by using sperm and egg which contain identical DNA e. Fertilization of a very young egg by a very old sperm Ans. a 6. The phenotype of an organism a. cannot be seen with the naked eye b. occurs only in males c. represents an individual’s genetic composition d. reflects traits that are expressed, seen, or otherwise detected e. represents the relationship between genes and alleles Ans: d 7. Which word below describes an organism that has two genetic factors (alleles) identical for a particular trait? a. homozygous b. heterozygous c. heterogametic d. homogametic e. a and d Ans: a 25
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Chapter 3 8. What is the largest number of alleles for a particular gene that is normally carried by an organism? a. 0 b. 1 c. 2 d. 3 e. 10 Ans: c 9. What is the number of alleles for a particular gene carried by an organism homozygous for that gene? a. 0
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This note was uploaded on 10/10/2011 for the course BIOL 100 taught by Professor Hurley during the Spring '09 term at Idaho State University.

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ch03 - Chapter 3 Mendelian Genetics: How Are Traits...

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