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Ch. 7 IR: Team Bio.

Extending Mendelian Genetics

carrier Someone who is heterozygous, does not have a disorder, but carries the recessive allele, and can pass on the allelle to the offspring. Example: Colorblindedness: A mother may able to see red and green but her son may not.
X chromosomal inactivation The process by which one of the two X chromosomes in every cell in female mammals gets turned off.
incomplete dominance When allelles are neither dominant or recessive. Example: Snapdragon and four o'clock plants: When homozygous red flowers are crossed with homozygous white flowers, the offspring have pink flowers.
codominance Both allelles are expressed completely, and neither is dominant or recessive. Example:In codominance, a homozygous red flower crossed wth a homozygous white flower would have red areas and white areas.
polygenic traits Traits produced by two or more genes. Example: eye color(3+ genes) and skin color (4 different genes)
linkage maps Show the relative locations of genes on a chromosome and estimate the distances between genes.
pedigree chart Uses family phenotypes for tracing genes in a family to determine the chance that a might have a certain genetic disorder.
karyotype A picture of all of the chromosomes of a cell.
sex-linked genes The genes on the sex chromosomes, usually the X chromosome because the Y chromosome is smaller and has many fewer genes.
Created by: llthompson