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25 Cards in this Set

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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?
46
What occurs during late PROPHASE I of MEIOSIS I?
Crossing over results in a mixing of chromosome segments from maternal & paternal chromosomes
What are HOMOLOGOUS Chromosomes?
Chromosomes that are similar in their size, shape, and gene content.
What is a VALID reason that SEX evolved?
Sexual reprodution allows offspring to be genetically different; Thus, Offspring may be genetically better equipped to adapt to changing environmental conditions and or disease.
Why did GREGOR MENDEL circumvent selfing in his genetic experiments?
Mendel used very controlled crosses of pure pea strains to study that plant's genetics
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?
Mendel had to confirm that the transmission of the seed shape trait was not related to the sex of the parent
Why did GREGOR MENDEL conduct a DIHYBRID CROSS
Mendel wanted to test the hypothesis thath alleles separate & assort independently just before gamete production
The CHROMOSOME THEORY of INHERITANCE states which of the following?
Segregation & independent alignment of homologous chromosomes during MEIOSIS I explain Mendel's rules of inheritance
2 Significant results of MEIOSIS I are?
Crossing over of genetic material between non-sister chromatides and separation of homologs prior to gamete formation.
What are true for GENES?
A.Some alleles of the same gene can be codominant with both phenotypes expressed in the individual.
B.Genes can influence one another
The 2 Fundamental tenets of the THEORY OF EVOLUTION by NATURAL SELECTION are?
Species change through time & today's species are decended from pre-existing species.
What supports the idea that SPECIES have CHANGED through TIME?
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.
What provides EVIDENCE that SPECIES are RELATED & have COMMON ANCESTORY?
A.Developmental Homology
B.Structural Homology
C.Homologous chromosomes
D.Genetic homology
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?
CONVERGENT EVOLUTION
What conditions must be met to conduct a CONCLUSIVE TEST of NATURAL SELECTION?
VARIATION must be HERITABLE
Based on Overservation of MEDIUM GROUND FINCHES What happened?
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
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?
Some factor other than pollinator type must influence flower size between above and below tree-line poplulations of skypilots; further study if needed.
TRUE/FALSE Structural and developmental homologies result from genetic homologies?
True
True/FALSE Evolution causes individuals to change to meet new environmental changes/challenges?
False
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?
TRUE
TRUE/FALSE An organism that has 2 homologs for each type of chromosome is haploid?
False
TRUE/FALSE One of the primary results of MEIOSIS I is thath the sister chromatids of the homologs are separated into different daughter cells?
False
TRUE/FALSE The phenotype of an organism is the observable expression of its genotype?
TRUE
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?
FALSE
TRUE/FALSE THE MESELSON-STAHL experiments concluded that DNA replication is conservative?
False