Chapter 5 Vocab Flashcards
Exam 2
heteroplasmy
Mitochondria in the same cell that have different alleles of a gene.
expressivity
Severity or degree of a phenotype.
Linkage map
Diagrams that show gene order on chromosomes, determined from crossover frequencies between pairs of genes
centimorgan
A unit that indicates percent recombination between two loci linked on a chromosome, serving as a measure of relative distance.
antigen
A molecule that elicits an immune response.
incomplete dominance
A form of gene expression that results in a heterozygote intermediate in phenotype between either homozygote.
haplotype
A series of genes linked on a chromosome that do not separate by crossing over.
genetic heterogeneity
A phenotype that can be caused by variants of any of several genes.
Genetic Marker
A DNA sequence near a gene interest that is co-inherited unless separated by a cross over
phenocopy
An environmentally caused trait that occurs in a familial pattern, mimicking inheritance
linkage
Genes on the same chromosome
pleiotropic
A single-gene disease with several symptoms or a gene that controls several functions or has more than one effect, causing different symptom subsets in different individuals.
recombinant
A series of alleles on a chromosome that differs from the series of either parent.
linkage disequilibrium (LD)
A consequence of extremely tight linkage between DNA sequences in which two genes or DNA sequences are nearly always inherited together.
penetrance
Percentage of individuals with a genotype who have an associated phenotype.
epistasis
A gene masking or affecting the expression of another gene.
codominant
A form of gene expression in which both alleles are fully expressed in a heterozygote.
