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Exam 2

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Term
Definition
sex-linked   the inheritance of characteristics encoded by genes located on the sex chromosomes, which often differ in males and females  
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non-mendelian   general term that refers to any pattern of inheritance in which traits do not segregate in accordance with Mendel’s laws.  
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sex influenced   Autosomal trait expressed as a dominant in one sex and as a recessive in the other (ex: male pattern baldness)  
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sex-limited   Autosomal trait expressed in one sex only (ex: cock feathering)  
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polygenic inheritance   recognizable by their expression as a gradation of small differences (ex: many genes and factors affect your height and skin color)  
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barr bodies   the random inactivation of additional X chromosomes  
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aneuploidy   change in the number of individual chromosomes (+/-) that can occur due to multiple reasons  
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epistasis   term applied when one gene interferes with the expression of another  
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pleiotropy   the effect of a single gene on more than one characteristic.  
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nondisjunction   the chromosome pairs fail to separate in meiosis I  
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palindromic   read the same forward and backward on opposite DNA prime sides  
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karyotype analysis   a match display of chromosomes that is not representative of how they are in the cell  
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holandric   passing from father to son  
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incomplete dominance   a condition when neither allele is dominant over the other; heterozygotes express an intermediate phenotype relative to the parental phenotypes (ex: pink snapdragons)  
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codominance   occur when rather than expressing an intermediate phenotype, the heterozygotes express both phenotypes (ex: AB blood type)  
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penetrance   Percentage of organisms that have a given Genotype that then express the Phenotype  
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expressivity   Degree to which a character is expressed  
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Rh incompatibility   If the mother is Rh- and the baby is Rh+, mother will develop an antigen to the Rh+. If she tries to have a 2nd baby, her white blood cells will attack the babies (Rh+) red blood cells and lyse them. If mother is Rh+ and baby is Rh- then nothing happens.  
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mutually exclusive   one event will prevent another event from happening  
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Autosomal   not sex linked  
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Created by: JacobGant
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