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20 Cards in this Set
- Front
- Back
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Which ofthe following statements about genes is incorrect?
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One gene only is used in a specific cell type
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If a horticulturist breeding gardenias succeeds in having a single plant with a particularly desirable set of traits, which of the following would be her most probable and efficient route to establishing a line of such plants?
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Clone the plant asexually to produce an identical one
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Asexual reproduction results in identical offspring unless which of the following occurs?
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Mutation
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The human genome is minimally contained in which of the following?
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Every human cell
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At which stage of mitosis are chromosomes usually photographed in the preparation of a karyotype?
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Metaphase
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Referring to a plant sexual life cycle, which of the following terms describes the process that leads directly to the formation of gametes?
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Gametophyte mitosis
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Which of the following is an example of alternation of generations?
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A diploid plant (sporophyte) produces, by meiosis, a spore that gives rise to a multicellular, haploid pollen grain (gametophyte).
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The karyotype of one species of primate has 48 chromosomes. In a particular female, cell division goes awry and she produces one of her eggs with an extra chromosome (25). The most probable source of this error would be a mistake in which of the following?
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Either anaphase I or II
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How do cells at the completion of meiosis compare with cells that have replicated their DNA and are just about to begin meiosis
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They have half the number of chromosomes and one-fourth the amount of DNA
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When does the synaptonemal complex disappear
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Late prophase of meiosis I
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Which of the following happens at the conclusion of meiosis I?
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Homologous chromosomes are separated
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A cell divides to produce two daughter cells that are genetically different
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The statement is true for meiosis I only
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Independent assortment of chromosomes occurs
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The statement is true for meiosis I only
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If an organism is diploid and a certain gene found in the organism has 18 known alleles (variants), then any given organism of thatspecies can/must have which of the following?
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At most, 2 alleles for that gene
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Chiasmata are what we see under a microscope that let us know which of the following is occurring
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Crossing over
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How does the sexual life cycle increase the genetic variation in a species
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By allowing independent assortment of chromosomes
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For a species with a haploid number of 23 chromosomes, how many different combinations of maternal and paternal chromosomes are possible for the gametes
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About 8 million
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Independent assortment of chromosomes is a result of
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the random and independent way in which each pair of homologous chromosomes lines up at the metaphase plate during meiosis I
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When pairs of homologous chromosomes separate during anaphase I,
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the sister chromatids remain attached to one another
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Homologous chromosomes move toward opposite poles of a dividing cell during
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meiosis I.
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