Biology Exam 3

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mlucas53
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Biology Exam 3
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2010-11-27 02:02:06
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Flashcards to help study for the exam three
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  1. The Parent individuals from which offspring are derived in studies of in heritance. P stands for parental.
    P generation
  2. The exchange of segments between chromatids of homologous chromosomes during prophase 1 of meisosis.
    crossing over
  3. Having two identical alleles for a given gene.
    homozygous
  4. A basic principle in biology stating that genes are located in chromosomes and that the behavior of chromosomes during meiosis accounts for inheritance patterns.
    Chromosome Theory Of Inheritance
  5. Having two different allelles for a given gene
    Heterozygous
  6. A chromosome not directly involved in determining the sex of an organism; in mammals, for example, any chromosome other than X or y
    Autosome
  7. The microscopically visible site where crossing over has occured between chromatids of homologous chromosomes during prophase 1 of meiosis
    Chiasma
  8. The region of a chromosome where two sister chromatids are joined and where spindle microtubules attach during mitosis and meiosis. The centromere divides at the onset of anaphase during mitosis and anaphase 11 of meiosis
    centromere
  9. A diagram used in the study of inheritance to show the results of random fertilization
    Punnett square
  10. The creation of genetically distinct offspring by the fusion of two haploid sex cells (gametes: sperm and egg), forming a diploid zygote
    Sexual Reproduction
  11. With respect to given genes, the number of recombinant progeny from a mating divided by the total number of progeny. Recombinant progent carry combinations of alleles different from that seen in either of the parents as a result of independent assortment of chromosomes and crossing over.
    recombination frequency
  12. In a sexually reproducing organism, the division of a single diploid cell into four haploid daughter cells. Meiosis and cytokinesis produce haploid gametes from diploid cells in the reproductive organs of the parents
    Meiosis
  13. The particular site where a gene is found on a chromosome. homologous chromosomes have corresponding gene loci
    locus
  14. The offspring of two parental ( P. generation) individuals. F1 stands for first filial.
    F1 generation
  15. character
    A heritable feature that varies amonf individuals within a population, such as flower color in pea plants
  16. An alternatative version of a gene
    allelles
  17. cross
    The cross-fertilization of two different varieties of an organism or of two different species; also called hybridization.
  18. A cyclically operating set of proteins that triggers and coordinates events in the eukaryotic cell cycle
    cell cycle control system
  19. The additive effect of two or more genes on a single phenotypic characteristic.
    polygenic inheritance
  20. Material in the cytoplasm of a eukaryotic cell that gives rise to microtubules; important in mitosis and meiosis; functions as a microtubule-organizing center
    Centrosome
  21. The third stage of mitosis, beginning when sister chromatids seperate from each other and ending when a complete set of daughter chromosomes has arrived at each of the two poles of the cell
    anaphase
  22. The scientific study of heredity ( inheritance)
    Genetics
  23. An abnormal mass of cells that froms within otherwise normal tissue
    tumor
  24. Referring to organisms for which sexual reproduction offspring with inherited traits indentical to those of the parents. The organisms are homozygous for the characteristics under consideration.
    True-breeding
  25. The production of offspring with gene combinations that differ from that found in either parent
    genetic recombination
  26. Down syndrome
    trisomy 21
  27. Treatment for cancer in which drugs are administered to disrupt cell division of the cancer cells
    Chemotherapy
  28. The second stage of mitosis. During metaphase, the centromeres of all the cell's dupicated chromosomes are lined up in imaginary plate equidistant between the poles of the mitotic spindle
    metaphase
  29. Containing two sets of chromosomes ( homologous pairs) in each cell, one set ingerited from each parent; referring to a 2n cell
    diploid
  30. The phase in the eukaryotic cell cycle when the cell is not actually dividing. During interphase, cellular metabolic activity is high, chromosomes and organelles are duplicated, and cell size may increase. ______ accounts for 90% of the cel cycle.
    interphase
  31. A malignant growth or tumor caused by abnormal and uncontrolled cell division.
    cancer
  32. in a heterozygote, the allele that determines the phenotype with respect to a paticular gene
    dominant allele
  33. An abnormal tissue mass that spreads into neighboring tissue and to other parts of the body; a cancerous tumor
    malignant tumor
  34. The expressed traits of an organism
    phenotype
  35. Treatment for cancer in which parts of the body that have cancerous tumors are exposed to high energy radiation to disrupt cell dicision of the cancer cells
    radiation therapy
  36. The forth and final stage of mitosis, during which daughter nuclei from at the two poles of a cell. Telophase usually occurs together with cytokinesis
    telophase
  37. A variant of a character found within a population, such as purple flowers in pea plants
    trait
  38. The first sign of cytokinesis during cell division in an animal cel; a shallow groove in the cell surface near the old metaphase plate
    cleavage furrow
  39. A rule stating that the probability of a compound event is the product of the seperate probablities of the independent events
    rule of multiplication
  40. One of the two identical parts of a duplicated chromosome. While joined, two sister chromatids make up one chromosomes

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