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Definition
| gene located on the X or chromosome |
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Definition
| error in meiosis in which homologous chromosomes fail to seperate |
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Definition
| Males have just one X chromosome. Thus, all X-linked alleles are expressed in males, even if they are ressecive |
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Definition
| If nondisjunction occurs, abnormal numbers of chromosomes may find their way into gametes, and a disorder of chromosome numbers may result |
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| A Human diploid cell contains |
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Definition
| more than 6 billion base pairs of DNA |
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| Smallest Human Autosomes? |
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Definition
21 and 22
Chromosome 21:43 million DNA base pairs
Chromosome 22:32 million DNA base pairs |
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| Many sex-linked genes are found on the |
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Definition
X chromosome
(more then 100 sex-linked disorders) |
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Definition
an inability to distinguish certain colors
Most common form: red-green colorblindness
Males |
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Definition
Two important genes carried on the X chromosome help control blood clotting
-occurs when a protein nessecary for blood clotting is missing. |
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| Duchenne Muscular Dystrophy |
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Definition
results in the progressive weakening and loss of skeletal muscle
--1/3000 males |
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Term
| X-Chromosome Inactivation |
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Definition
| In females one X chromosome is randomly switched off; The turned-off chromosome forms a dense region in the nucleus known as a Barr body. |
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