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22 Cards in this Set
- Front
- Back
The restoration of the diploid chromosome number after halving in meiosis is due to
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fertilization
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What is a karyotype?
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a pictorial display of an individuals chromosomes
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What are autosomes?
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chromosomes other than sex chromosomes
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A synatptonemal complex would be found during
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prophase I of meiosis
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During the first meiotic division (meiosis I)
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homologous chromosomes separate
the chromosome number becomes haploid crossing over between nonsister chromatids occurs paternal and maternal chromosomes assort randomly |
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A cell with a diploid number of 6 could produce gametes with how many different combinations of maternal and paternal chromosomes?
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8
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The DNA content of a diploid cell is measured in the G1 phase. After meiosis I, the DNA content of one of the two cells produced would be
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equal to that of the G1 cell
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In most fungi and some protists
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the mulitcellular organism is haploid
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In the alternation of generations found in plants
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the gametophyte generation produces gametes by meiosis
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What is likely to be a source of genetic variation in sexually reproducing organisms?
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crossing over
independent assortment of chromosomes random fertilization of gametes mutation |
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What is least likely to be a source of genetic variation in sexually reproducing organisms?
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replication of DNA during S phase before meiosis I
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Meiosis II is similar to mitosis because
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sister chromatids separate
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Pairs of homologous chromosomes
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have genes for the same traits at the same loci
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Asexual reproduction of a diploid organism would
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produce identical offsrping
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In sexually reproducing species with a diploid number of 8, how many different combinations of paternal and maternal chromosomes would be possible in offspring?
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256
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How many chromatids are present in metaphase II in a cell undergoing meiosis from an organism in which 2n=24?
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24
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What is considered to be a haploid cell?
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a daughter cell after meiosis II
gamete daughter cell after mitosis in gametophyte generation of a plant cell in prophase II |
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What is not considered to be a haploid cell?
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a cell in prophase I
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Homologous Chromosomes
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behave independently in mitosis
travel together to the metaphase plate in prometaphase of meiosis I Each parent contributes one set of homologous chromosomes to an offspring Crossing over between nonsister chromosomes is indicated by the presence of chiasmata |
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What is not true of Homologous Chromosomes?
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They synapse during S phase of meiosis
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What describes why or how recombinant chromosomes add to genetic variability?
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they randomly orient during metaphase II and the nonequivalent sister chromatids separate in anaphase II
Genetic material from two parents is combined on the same chromosome |
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A cell in G2 phase before meiosis compared with one of the four cells produced by that meiotic division has
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four times as much DNA and twice as many chromosomes.
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