24022897-Biology-Study-Guide-3 - Biology Study Guide 3 1 )...

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Biology Study Guide 3 1) A cross between homozygous purple - flowered and homozygous white - flowered pea plants results in offspring with purple flowers. This demonstrates 1) _______ A) the mistakes made by Mendel. B) true - breeding. C) dominance. D) a dihybrid cross. E) the blending model of genetics. 2) A plant with purple flowers is allowed to self - pollinate. Generation after generation, it produces purple flowers. This is an example of 2) _______ A) hybridization. B) true - breeding. C) polygenetics. D) the law of segregation. 3) The offspring of Mendel's classic pea cross always looked like one of the two parental varieties because 3) _______ A) each allele affected phenotypic expression. B) different genes interacted to produce the parental phenotype. C) the traits blended together during fertilization. D) one allele was completely dominant over another. E) no genes interacted to produce the parental phenotype. 4) What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants? 4) _______ A) An organism that is homozygous for many recessive traits is at a disadvantage. B) Genes are composed of DNA. C) There is considerable genetic variation in garden peas. D) Traits are inherited in discrete units, and are not the results of "blending." E) Recessive genes occur more frequently in the than do dominant ones. 5) When crossing a homozygous recessive with a heterozygote, what is the chance of getting an offspring with the homozygous recessive phenotype? 5) _______ A) 25% B) 100% C) 75% D) 50% E) 0% 6) What are Punnett squares used for? 6) _______ A) testing for the presence of the recessive allele B) predicting the result of genetic crosses between organisms of known genotypes C) determining the DNA sequence of a given gene D) identifying the gene locus where allelic variations are possible E) more than one of the above 7) Which of the following is (are) true for alleles? 7) _______ A) They can represent alternative forms of a gene.
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B) They can be identical or different for any given gene in a somatic cell. C) They can be dominant or recessive. D) Only A and B are correct. E) A, B, and C are correct. 8) It was important that Mendel examined not just the F 1 generation in his breeding experiments, but the F 2 generation as well, because 8) _______ progeny would have allowed him to discover the law of segregation, but not the law of independent assortment. B) he obtained very few F 1 progeny, making statistical analysis difficult. C) the dominant phenotypes were visible in the F 2 generation, but not in the F 1 . D) parental traits that were not observed in the F 1 reappeared in the F 2 , suggesting that the traits did not truly disappear in the F 1 . E) all of the above 9) Black fur in mice ( B ) is dominant to brown fur ( b ). Short tails ( T ) are dominant to long tails ( t ). What fraction of the progeny of the cross BbTt × BBtt will have black fur and long tails?
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This note was uploaded on 12/06/2010 for the course BIOL 1020 taught by Professor Shaw during the Spring '10 term at Baltimore Hebrew University.

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24022897-Biology-Study-Guide-3 - Biology Study Guide 3 1 )...

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