Genetics: Test Questions

Only available on StudyMode
  • Download(s) : 45
  • Published : July 29, 2011
Open Document
Text Preview
Name: ________________________ Class: ___________________ Date: __________

ID: A

Genetics test questions
Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____ 1. Pea plants were particularly well suited for use in Mendel's breeding experiments for all of the following reasons except that a. peas show easily observed variations in a number of characters, such as pea shape and flower color. b. it is possible to completely control matings between different pea plants. c. it is possible to obtain large numbers of progeny from any given cross. d. peas have an unusually long generation time. e. many of the observable characters that vary in pea plants are controlled by single genes. 2. A plant with purple flowers is allowed to self-pollinate. Generation after generation, it produces purple flowers. This is an example of a. hybridization. b. incomplete dominance. c. true-breeding. d. the law of segregation. e. polygenetics. 3. Which of the following statements about Mendel's breeding experiments is correct? a. None of the parental (P) plants were true-breeding. b. All of the F2 progeny showed a phenotype that was intermediate between the two parental (P) phenotypes. c. Half of the F1 progeny had the same phenotype as one of the parental (P) plants, and the other half had the same phenotype as the other parent. d. All of the F1 progeny resembled one of the parental (P) plants, but only some of the F2 progeny did. e. none of the above 4. What is the difference between a monohybrid cross and a dihybrid cross? a. A monohybrid cross involves a single parent, whereas a dihybrid cross involves two parents. b. A monohybrid cross produces a single progeny, whereas a dihybrid cross produces two progeny. c. A monohybrid cross involves organisms that are heterozygous for a single character, whereas a dihybrid cross involves organisms that are heterozygous for two characters. d. A monohybrid cross is performed only once, whereas a dihybrid cross is performed twice. e. A monohybrid cross results in a 9:3:3:1 ratio whereas a dihybrid cross gives a 3:1 ratio. 5. A cross between homozygous purple-flowered and homozygous white-flowered pea plants results in offspring with purple flowers. This demonstrates a. the blending model of genetics. b. true-breeding. c. dominance. d. a dihybrid cross. e. the mistakes made by Mendel.

____

____

____

____

1

Name: ________________________ ____

ID: A

____

____

____

____

____

____

6. The F1 offspring of Mendel's classic pea cross always looked like one of the two parental varieties because a. one allele was completely dominant over another. b. each allele affected phenotypic expression. c. the traits blended together during fertilization. d. no genes interacted to produce the parental phenotype. e. different genes interacted to produce the parental phenotype. 7. What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants? a. There is considerable genetic variation in garden peas. b. Traits are inherited in discrete units, and are not the results of "blending." c. Recessive genes occur more frequently in the F1 than do dominant ones. d. Genes are composed of DNA. e. An organism that is homozygous for many recessive traits is at a disadvantage. 8. Which of the following is (are) true for alleles? a. They can be identical or different for any given gene in a somatic cell. b. They can be dominant or recessive. c. They can represent alternative forms of a gene. d. Only A and B are correct. e. A, B, and C are correct. 9. What is genetic cross between an individual showing a dominant phenotype (but of unknown genotype) and a homozygous recessive individual called? a. a self-cross b. a testcross c. a hybrid cross d. an F1 cross e. a dihybrid cross 10. How many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE? a....
tracking img