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-the complete set of genetic material in an organism
-fits in the nucleus of a single cell |
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| -DNA wraps aroud these small protiens
-similar to thread tightly wrapped around a spool(DNA is the thread and [image] |
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condidtion in which someone has three number 21 chromosomes
-results froma an error during either stage of meiosis, most commonly during Meiosis I
-coomonly known as Down Syndrome |
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-more common name for trisomy 21
-named after John Langdon Down who described the syndrome in 1866
-symptoms include:below average height,charisteristic facial features,impaired immune system,varying degrees of mental disability |
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| when homologous chromosomes or sister chromatids fail to fail to separate during meiosis
-can occur in anaphase of meiosis I or II
-results in genomes with an abnormal number of chromosomes[image] |
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| -when part of a chromosome is repeated
-a kind of change in the chromosome structure that may cause disorders[image] |
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| when a fragment of a chromosome is lost
-a kind of change in the chromosome structure that may cause disorders[image] |
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| the reversing of a fragment of the original chromosome
-a kind of change in the chromosome structure that may cause disorders[image] |
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| when a fragment of one chromosome attaches to a nonhomologous chromosome
-a kind of change in the chromosome structure that may cause disorders[image] |
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| a family tree that records and traces the occurance of a trait in a family[image] |
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| an individual who has one copy of the allele for a recessive disorder and does not exhibit syptoms is a carrier of the disorder |
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| protien that initiates cell division |
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| gene that codes for a protien that stops cell division in particulat situatuins |
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