Biology Unit 4 Vocab

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Biology

9th

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42 Terms

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anaphase
Third stage of mitosis, beginning when sister chromatids separate from each other and ending when a complete set of daughter chromosomes has arrived at each of two poles of the cell.
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asexual reproduction
The creation of genetically identical offspring by a single parent, without the participation of gametes (sperm and egg).
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autosome
A chromosome not directly involved in determining the sex of an organism; in mammals, for example, any chromosome other than X or Y.
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benign tumor
An abnormal mass of cells that remains at its original site in the body.
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cancer
A malignant growth or tumor caused by abnormal and uncontrolled cell division.
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cell cycle
An ordered sequence of events (including interphase and the mitotic phase) that extends from the time a eukaryotic cell is first formed from a dividing parent cell until its own division into two cells.
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cell division
The reproduction of a cell.
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cell plate
A membranous disk that forms across the midline of a dividing plant cell. During cytokinesis, the cell plate grows outward, accumulating more cell wall material and eventually fusing into a new cell wall.
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centromere
The region of a chromosome where two sister chromatids are joined and where spindle microtubles attach during mitosis and meiosis. The \___________ divides at the onset of anaphase during mitosis and anaphase II.
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chemotherapy
Treatment for cancer in which drugs are administered to disrupt cell division of the cancer cells.
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chiasma
microscopically visible site where crossing over has occured between chromatids of homologous chromosomes during prophase I of meiosis.
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chromosome
A gene-carrying structure found in the nucleus of a eukaryotic cell and most visible during mitosis and meiosis; also, the main gene-carrying structure of a prokaryotic cell. Each \__________ consists of one very long threadlike DNA molecule and associated proteins.
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cleavage furrow
The first sign of cytokinesis during cell division in an animal cell; a shallow groove in the cell surface near the old metaphase plate.
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crossing over
The exchange of segments between chromatids of homologous chromosomes during prophase I of meiosis.
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cytokinesis
The division of the cytoplasm to form two separate daughter cells. \___________ usually occurs during telophase of mitosis, and the two processes (mitosis and \______________) make up the mitotic (M) phase of the cell cycle.
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diploid
Containing two sets of chromosomes (pairs of homologous chromosomes) in each cell, one set inherited from each parent; referring to a 2n cell.
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Down Syndrome
A human genetic disorder resulting from a condition called trisomy 21, the presence of an extra chromosome 21; characterized by heart and respiratory defects and varying degrees of mental retardation.
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fertilization
The union of a haploid sperm cell with a haploid egg cell, producing a zygote.
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gamete
A sex cell; a haploid egg sperm. The union of two \__________ of opposite sex (fertilization) produces a zygote.
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genetic recombination
The production of offspring with gene combinations that differ from that found in either parent.
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haploid
containing a single set of chromosomes; referring to an n cell.
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histone
A small protein molecule associated with DNA and important in DNA packing in the eukaryotic chromosome.
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homologous chromosome
The two chromosomes that make up a matched pair in a diploid cell. \_________________are of the same length, possess genes for the same characteristics at corresponding loci. One \_________________ is inherited from the organisms father, the other from the mother.
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interphase
The phase in the eukaryotic cell cycle when the cell is not actually dividing. During \__________, cellular metabolic activity is high, chromosomes and organelles are duplicated, and cell size may increase. Interphase accounts for 90% of the cell cycle.
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karyotype
A display of micrographs of the metaphase chromosomes of a cell, arranged by size and centromere position.
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life cycle
The entire sequence of stages in the life of an organism, from the adults of one generation to the adults of the next.
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malignant tumor
An abnormal tissue mass that spreads into neighboring tissue and to other parts of the body; a cancerous tumor.
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meiosis
In a sexually reproducing organism, the process of cell division that produces haploid gametes from diploid cells within the reproductive organs.
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metaphase
The second stage of mitosis. During \_____________, the centromeres of all the cell's duplicated chromosomes are lined up on an imaginary plate equidistant between the poles of the mitotic spindle.
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metastasis
The spread of cancer cells beyond their original site.
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mitosis
The division of a single nucleus into two genetically identical daughter nuclei. ________ and cytokinesis make up the mitotic (M) phase of the cell cycle.
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mitotic spindle
A spindle-shaped structure formed of microtubles and associated proteins that is involved in the movement of chromosomes during mitosis and meiosis. (A spindle is shaped roughly like a football).
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nondistjunction
An accident of meiosis or mitosis in which a pair of homologous chromosomes or a pair of sister chromatids fail to separate at anaphase.
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prophase
The first stage of mitosis. During ________, duplicated chromosomes condense to form structures visible with a light microscope, and the mitotic spindle forms and begins moving the chromosomes toward the center of the cell.
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radiation therapy
Treatment for cancer in which parts of the body that have cancerous tumors are exposed to high-energy radiation to disrupt cell division of the cancer cells.
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sex chromosome
A chromosome that determines whether an individual is male or female; in mammals, for example, the x or y chromosome.
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sexual reproduction
The creation of genetically distinct offspring by the fusion of two haploid sex cells (gametes; sperm and egg), forming a diploid zygote.
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sister chromatid
one of the two indentical parts of a duplicated chromosome while joined, two \__________ make up one chromosome; chromatids are eventually separated druing mitosis or meiosis II.
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somatic cell
Any cell in a multicellular organism except a sperm or egg cell or a cell that develops into a sperm or egg; a body cell.
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telophase
The fourth and final stage of mitosis, during which daughter nuclei form at the two poles of a cell. \_______ usually occurs together with cytokinesis.
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tumor
An enlargement at the end of a rhizome, in which food is stored.
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zygote
The fertilized egg, which is diploid, that results from the union of haploid gametes (sperm and egg) during fertilization.