genetics online quizes

genetics online quizes - 1 Which of the following were key...

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1 Which of the following were key reasons for Mendel's success in elucidating his genetic laws? A) Mendel had a strong understanding of the chemical nature of cells and knew DNA was passed on between generations. This is the correct answer. B) Mendel carefully established true breeding lines and used them in hybridization experiments carried out over multiple generations. C) Mendel's use of peas as a model organism and his experience with plant breeding in his father's orchard. D) Mendel was able to dedicate the efforts of a large research team and arranged to have very large test plots available for growing the numbers of plants required. E) All of the above 2 Which is NOT a characteristic that made peas useful as a model system for Mendel's studies? A) They are diploid and produce haploid gametes. B) They have a complex phenotype with much genetic variability. C) They are relatively small and easy to grow. This is the correct answer. D) They produce edible fruit. E) None of these; all of these are useful characteristics 3 How might the ability of pea plants to self fertilize be a problem for genetic experiments? A) Self fertile plants tend to be weaker and require more care. B) Self fertile plants are not able to produce viable seeds due to inbreeding. This is the correct answer. C) Stamens must be removed from self fertile plants to control fertilization. D) Pistils of self fertile plants are unable to accept pollen from other plants. 4 Which description of plants from a true breeding strain is correct? This is the correct answer. A) They only have one allele of the gene that controls the
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trait of interest. B) They carry two different alleles for the gene that controls the trait of interest. C) They can only reproduce by self fertilization. D) They all have dominant alleles for the trait of interest. Feedback: Each diploid individual carries two alleles, but those alleles must be identical in individuals from a true breeding strain. 5 Drosophila females are capable of storing sperm and using it to fertilize eggs long after mating. How might this present a problem for a geneticist? This is the correct answer. A) In order to design a specific cross, females must be prevented from mating with any other strain of males. B) This allows Drosophila females to "select" sperm from the stronger male. C) Individual offspring from these females may have more than one father. D) This should not present a problem for a geneticist; it is merely a reproductive advantage to the fly if the population size is low. 6 In single factor crosses between two true breeding strains of tree frog, a scientist discovers that plain green tree frogs and tree frogs with a red 'racing stripe' always produce offspring that have red racing stripes. Why? This is the correct answer.
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This note was uploaded on 04/29/2008 for the course EBIO 111 taught by Professor Henry during the Spring '08 term at Tulane.

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genetics online quizes - 1 Which of the following were key...

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