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25 Cards in this Set
- Front
- Back
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The karyotype of Homo sapiens includes 46 Chromosomes. How many chromosomes are in a daughter cell after a parent skin cell of H. sapiens divides by mitosis?
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46
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What occurs during late PROPHASE I of MEIOSIS I?
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Crossing over results in a mixing of chromosome segments from maternal & paternal chromosomes
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What are HOMOLOGOUS Chromosomes?
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Chromosomes that are similar in their size, shape, and gene content.
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What is a VALID reason that SEX evolved?
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Sexual reprodution allows offspring to be genetically different; Thus, Offspring may be genetically better equipped to adapt to changing environmental conditions and or disease.
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Why did GREGOR MENDEL circumvent selfing in his genetic experiments?
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Mendel used very controlled crosses of pure pea strains to study that plant's genetics
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Why did GREGOR MENDEL conduct a reciprocal cross after his 1st experiment involving the transmission of a single trait from the parental generation to the F1 generation?
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Mendel had to confirm that the transmission of the seed shape trait was not related to the sex of the parent
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Why did GREGOR MENDEL conduct a DIHYBRID CROSS
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Mendel wanted to test the hypothesis thath alleles separate & assort independently just before gamete production
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The CHROMOSOME THEORY of INHERITANCE states which of the following?
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Segregation & independent alignment of homologous chromosomes during MEIOSIS I explain Mendel's rules of inheritance
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2 Significant results of MEIOSIS I are?
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Crossing over of genetic material between non-sister chromatides and separation of homologs prior to gamete formation.
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What are true for GENES?
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A.Some alleles of the same gene can be codominant with both phenotypes expressed in the individual.
B.Genes can influence one another |
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The 2 Fundamental tenets of the THEORY OF EVOLUTION by NATURAL SELECTION are?
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Species change through time & today's species are decended from pre-existing species.
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What supports the idea that SPECIES have CHANGED through TIME?
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A.Transistional forms in the FOSSIL record.
B.Similarities between fossils & Extant species within the same region. C.Presence of fossils and extinct species that are unlike any extant species. D.Tectonic changes over time that changed environments. |
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What provides EVIDENCE that SPECIES are RELATED & have COMMON ANCESTORY?
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A.Developmental Homology
B.Structural Homology C.Homologous chromosomes D.Genetic homology |
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What type of EVOLUTION is said to OCCUR when Natural Selection favors similar morphological characteristics as solutions to problems of shared life strategies in 2 different, unrelated species?
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CONVERGENT EVOLUTION
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What conditions must be met to conduct a CONCLUSIVE TEST of NATURAL SELECTION?
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VARIATION must be HERITABLE
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Based on Overservation of MEDIUM GROUND FINCHES What happened?
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Natural Selection acted on individual finches, and, as a result, some finches with advantageous (adaptive) traits were more reproductively successful & the population thus evolved to be comprised of mostly individuals with these traits
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What would the conclusion for the preceding experiment be if there were no significant difference in flower size between bumble bee-pollinated plants & the control group?
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Some factor other than pollinator type must influence flower size between above and below tree-line poplulations of skypilots; further study if needed.
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TRUE/FALSE Structural and developmental homologies result from genetic homologies?
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True
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True/FALSE Evolution causes individuals to change to meet new environmental changes/challenges?
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False
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TRUE/FALSE The MESELSON-STAHL experiment to test the THEORY OF DIRECTED DISPERSAL was to provide both the cactus mice and curve-billed with hackberries?
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TRUE
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TRUE/FALSE An organism that has 2 homologs for each type of chromosome is haploid?
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False
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TRUE/FALSE One of the primary results of MEIOSIS I is thath the sister chromatids of the homologs are separated into different daughter cells?
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False
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TRUE/FALSE The phenotype of an organism is the observable expression of its genotype?
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TRUE
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TRUE/FALSE A testcross can be used to determine weather a trait is sex-linked, sex matter in the transfer of a trait to the offspring?
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FALSE
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TRUE/FALSE THE MESELSON-STAHL experiments concluded that DNA replication is conservative?
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False
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