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Terms

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Question
Answer
Dysmorphology   Study of atypical anatomical development or morphogenetic, resulting in abnormal physical features  
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Malformation   Structural defect in an organ or body part due to abnormal development process (cleft palate, polydactyly)  
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Dysphagia   Abnormal organization of cells into tissues and the structural consequences (hemangioma, limb defect)  
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Deformation   Alteration in the form, shape, or position of a normally formed body part by mechanical forces in the fetal period (not embryogenesis) and can be due to intrinsic or extrinsic forces. (plagiocephaly, internal tib rotation)  
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Homozygous   Same allele on both chromosome pairs  
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Heterozygous   Different alleles on each chromosome  
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Genotype   Persons alleles and precise genetic makeup at a specific locus  
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Phenotype   The physical manifestation of the genotype (the genotype and phenotype donta always agree)  
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Polymorphism   Alteration not causing a disease  
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Mutation   Genetic alteration that causes a disease  
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Dominant disease   Singlemcopy of a mutation so that heterozygotes will be affected  
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Haploisufficiency   Occurs in dominant disorders when there is a 50% reduction in a protein and then causes a loss of function disease  
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Recessive genetic disorders   Requires both copies of the allele to be mutated  
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Craniosynostosis   Caused by abnormal differentiation of neural crest cells and has now been associated with nearly 100 syndromes.  
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Chromosomal abnormalities   Chrom # or structure is altered. Cause genetic disordered. In general not hereditary.  
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Mosaic trisomy   Full trisomy conception followed by loss of extra chromosome in some cells during mitosis of embryo. Clinical manifestations are then mild.  
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