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Definition
| A chromosomal abberation in which one or more chromosomes are present in extra copies or are deficient in number. |
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Definition
| A dense object lying along the inside of the nuclear envelope in female mammalian cells, representing an inactivated X chromosome. |
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| Chromosome theory of inheritance |
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Definition
| A basic principle in biology stating that genes are located on chromosomes and that the behavior of chromosomes during meiosis accounts for inheritance patterns. |
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Definition
| The reciprocal exchange of genetic material between nonsister chromatids during prophase I of meiosis. |
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Definition
| Chart of a chromosome thhat locates genes with repect to chromosomal features. |
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Definition
| (1) A deficiency in a chromosome resulting from the loss of a fragment through breakage. (2) A mutational loss of one or more nucleotide pairs from a gene. |
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Definition
| A human genetic disease caused by presence of an extra chromosome 21; characterized by mental retardation and heart and respiratory effects. |
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| Duchenne muscular dystrophy |
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Definition
| A human genetic disease caused by a sex-linked recessive allele; characterized by progressive weakening and a loss of muscle tissue. |
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Definition
| An abberation in chromosome structure due to fusion with a fragment from a homologous chromosome, such that a portion of a chromosome is duplicated. |
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Definition
| An ordered list of genetic loci (genes or other genetic markers) along a chromosome. |
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Definition
| General term for the production of offspring that combine traits of the two parents. |
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Definition
| Phenomenon in which expression of an allele in offspring depends on whether the allele is inherited from the male or female parent. |
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Definition
| A human genetic disease caused by a sex-linked recessive allele; characterized by excessive bleeding following injury. |
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Definition
| A genetic map based on the frequencies of recombination between markers during crossing over of homologous chromosomes. |
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Definition
| Genes located close enough together on a chromosome to be usually inherited together. |
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Definition
| A unit of measurement of the distance between genes. One map unit is equivalent to a 1% recombination frequency. |
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Definition
| Referring to a cell that has only one copy of a particular chromosome, instead of the normal two |
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Definition
| An error in meiosis or mitosis, in which both members of a pair of homologous chromosomes or both sister chromatids fail to move apart properly. |
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Definition
| An offspring with a phenotype that matches one of the parental phenotypes. |
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Definition
| A chromosomal alteration in which the organism possesses more than two complete chromosome sets |
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Definition
| An offspring whose phenotype differs from that of the parents; also called recombinant type. |
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Definition
| A gene located on a sex chromosome |
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Definition
| (1) An aberration in chromosome structure resulting from attachment of a chromosomal fragment to a nonhomologous chromosome. (2) During protein synthesis, the third stage in the elongation cycle when the RNA carrying the growing polypeptide moves from the A site to the P site on the ribosome. (3) The transport of organic nutrients in the phloem of vascular plants. |
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Definition
| Referring to a cell that has three copies of a particular chromosome, instead of the normal two. |
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Definition
| An individual with the normal (most common) phenotype. |
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Definition
| A structural change with a chromosome whereby the order of gene loci is reversed. |
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